Just confirming what was said above; it is indeed the JPN rls:
Game_and_Watch_Collection_2_USA_NDS-iND
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Header Info for: ind-cgwepromo.nds
----------------------------------
Internal Name : GAMEWATCHC2
Game Serial : NTR-CGWJ-JPN
Maker Code : 01
Publisher : Nintendo
Version : 1.0 (00h)
Secure Checksum : 3A5F (BAD)
Logo Checksum : CF56 (OK)
Header Checksum : 952B (OK)
File Size : 18Mbit (2410496 bytes)
Card Size : 64Mbit (8388608 bytes) (06h)
File CRC32 : 69DD8A67
----------------------------------
Game_and_Watch_Collection_2_JPN_NDS-iND:
-----------------------------
Header Info for: ind-gwc2.nds
-----------------------------
Internal Name : GAMEWATCHC2
Game Serial : NTR-CGWJ-JPN
Maker Code : 01
Publisher : Nintendo
Version : 1.0 (00h)
Secure Checksum : 3A5F (BAD)
Logo Checksum : CF56 (OK)
Header Checksum : 952B (OK)
File Size : 64Mbit (8388608 bytes)
Card Size : 64Mbit (8388608 bytes) (06h)
File CRC32 : EA43F946
-----------------------------