The save that I was intending to use with a different region works.
I was using a patched version of SoulSilver (J) and renamed it and used it with my American version. Works nicely.
Thanks for the input.
Is there a way to convert a DS game save to a different region save file?
IE, a Japanese save to American save.
In other words, taking a Japanese ROM save and making it work with an American ROM.