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 User-defined characters (UDC) in IBM CJK code pages
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Trail bytes for EBCDIC UDC are 0x41–FE for Japanese and 0x41–7F,81–FD for everything else (presumably, the "everything else" was developed in tandem with Old PC Code, hence resembling the result of offsetting Shift JIS style trail bytes by 1 (since 0x40 is only allowed as part of 0x4040), while the Japanese one was developed before Shift JIS was a thing). GCGIDs are generated from EBCDIC by the usual method.

Japanese X series:
 EUC-JP ShiftJIS EBCDIC GCGID    AFP-GCGID UCS
 F5A1   F040     6941   X62P0080 IXU06941  E000
 ....   ....     ....   X...0080 IXU0....  ....
 FEFE   F4FC     6DF4   X6T00080 IXU06DF4  E3AB
 8FF5A1 F540     6DF5   X6T10080 IXU06DF5  E3AC
 ....   ....     ....   X...0080 IXU0....  ....
 8FFEFE F9FC     72EA   X7JE0080 IXU072EA  E757
------------------------------------------------ ["1880 UDCs" ends]
 ----   ----     72EB   X7JF0080 IXU072EB  E758
 ----   ----     ....   X...0080 IXU0....  ....
 ----   ----     7FFE   X9HA0080 IXU07FFE  F111
------------------------------------------------ [IBM-939 (as opposed to IBM-1399) ends]
 ----   ----     8041   X9HD0080 IXU08041  F112
 ----   ----     ....   X...0080 IXU0....  ....
 ----   ----     89BD   XAWT0080 IXU089BD  F83C

Simplified Chinese X series (code page 1383 ones are interspersed between standard chars):
 CP1383 CP1381 CP946 EBCDIC GCGID    AFP-GCGID UCS
 A2A1   8DA1   F040  7641   X8010080 EXU07641  E000
 ....   ....   ....  ....   X...0080 EXU0....  ....
 FEDF   9BCC   F76B  7D6C   X92K0080 EXU07D6C  E54F
 ----   9BCD   F76C  7D6D   X92L0080 EXU07D6D  E550
 ----   ....   ....  ....   X...0080 EXU0....  ....
 ----   A0FE   F9FC  7FFD   X9H90080 EXU07FFD  E757
---------------------------------------------------- ["1880 UDCs" and IBM-935 (as opposed to IBM-1388) end]
 ----   ----   ----  8041   X9HD0080 EXU08041  E758
 ----   ----   ----  ....   X...0080 EXU0....  ....
 ----   ----   ----  804E   X9HQ0080 EXU0804E  E765
---------------------------------------------------- [Ends except for T1K837U.CDP]
 ----   ----   ----  804F   X9HR0080 EXU0804F  E766
 ----   ----   ----  ....   X...0080 EXU0....  ....
 ----   ----   ----  80FD   X9ML0080 EXU080FD  E813

Traditional Chinese X series:
 EUC-TW CP938 Big5 Big5MS EBCDIC GCGID    AFP-GCGID UCS  
 ACA1A1 DB40  FA40 FA40   C241   XJ9D0080 TXU0C241  E000 
 ...... ....  .... ....   ....   X...0080 TXU0....  .... 
 ACA9C1 DF60  FEFE FEFE   C661   XJVL0080 TXU0C661  E310 
 ACA9C2 DF61  8E40 8E40   C662   XJVM0080 TXU0C662  E311 
 ...... ....  .... ....   ....   X...0080 TXU0....  .... 
 ACB4FE E4FC  94FA 94FA   CBFD   XKQL0080 TXU0CBFD  E757 
--------------------------------------------------------- ["1880 UDCs" ends]
 ACB5A1 E540  94FB 94FB   CC41   XKQP0080 TXU0CC41  E758 
 ...... ....  .... ....   ....   X...0080 TXU0....  .... 
 ACC9A8 EF47  A0FE A0FE   D648   XM880080 TXU0D648  EEB7 
 ACC9A9 EF48  8140 8140   D649   XM890080 TXU0D649  EEB8 
 ...... ....  .... ....   ....   X...0080 TXU0....  .... 
 ACDEEB F9E9  8DFE 8DFE   E0EA   XNU20080 TXU0E0EA  F6B0 
 ACDEEC F9EA  8181 C6A1   E0EB   XNU30080 TXU0E0EB  F6B1 
 ...... ....  .... ....   ....   X...0080 TXU0....  ....  [This extension in IBM Big5 has trail bytes 0x81–A0]
 ACE2D5 FBD3  8C82 C8C8   E2D4   XO440080 TXU0E2D4  F812 
 ACE2D6 FBD4  F9D6 C8C9   E2D5   XO450080 TXU0E2D5  F813 
 ...... ....  .... ....   ....   X...0080 TXU0....  .... 
 ACE2FE FBFC  F9FE C8F1   E2FD   XO590080 TXU0E2FD  F83B 
--------------------------------------------------------- [pre-2016 IBM's, as opposed to Microsoft's, (E)UDCs end]
 ------ ----  ---- C8F2   E341   XO5D0080 TXU0E341  F83C 
 ------ ----  ---- ....   ....   X...0080 TXU0....  .... 
 ------ ----  ---- C8FE   E34D   XO5P0080 TXU0E34D  F848 
--------------------------------------------------------- [Microsoft's EUDCs end]
 ------ ----  ---- ----   E34E   XO5Q0080 TXU0E34E  F849 
 ------ ----  ---- ----   ....   X...0080 TXU0....  .... 
 ------ ----  ---- ----   E447   XOAV0080 TXU0E447  F8FE 

Korean X series:
 EUC-KR IBM949 CP934 EBCDIC GCGID    AFP-GCGID UCS
 C9A1   C9A1   B040  D441   XLXD0080 FXU0D441  E000
 ....   ....   ....  ....   X...0080 FXU0....  ....
 C9FE   C9FE   B09E  D49F   XLZZ0080 FXU0D49F  E05D
 FEA1   FEA1   B09F  D4A0   XM000080 FXU0D4A0  E05E
 ....   ....   ....  ....   X...0080 FXU0....  ....
 FEFE   FEFE   B0FC  D4FD   XM2L0080 FXU0D4FD  E0BB
 ----   8FA1   B140  D541   XM2P0080 FXU0D541  E0BC
 ....   ....   ....  ....   X...0080 FXU0....  ....
 ----   9AA5   B6A3  DAA4   XMW40080 FXU0DAA4  E4CA
 ----   (9AA6) B6A4  DAA5   XMW50080 FXU0DAA5  E4CB
 ....   ....   ....  ....   X...0080 FXU0....  ....
 ----   (A0FE) B9FC  DDFD   XNEL0080 FXU0DDFD  E757