ROMs in general

I'm not sure if this goes here xD...but
Are US and European roms interchangable? Like can you use a US rom with a E save file?
Just curious because I thought I was playing Suikoden Tierkreis with the US file, but it turned out to be European I think...(I downloaded the March 12 one, but then a new U one came out like last week).Any help is appreciated.

you definately can't sorryand they are the same in english so why bother ???

because I don't know if there are differences, and because I've collected all 108 SoD's/Starbearers, and I don't want to start over. Also, I prefer U versions (I don't know why, it's just a personal preference)Ok then, because I heard that if people have a jap version of Pokemon Platinum, they could use that data for the Eng one (rumor? I have no idea).

i heard that to you just change the file name and make it the same

Oh and was there a mix-up in the ROM namings? I'm pretty sure that the ROM i downloaded had a (U), and there was no language selection. The, a couple days later I see a new Suikoden Tierkreis (U)(Xenophobia) and I got confused.

Not that I know of. I downloaded Suikoden Tierkreis the day it was available on Romulation, and it's (E). And there are no language selection in the European release either, it probably changes based on your DS settings.You could try doing as Bhatooth suggested. Make a copy of your save file, which is probably Suikoden Tierkreis (E)(VENOM).sav or something similar. Then rename it Suikoden Tierkreis (U)(Xenophobia).sav If it works, it works, if not, it'll fail and you just delete the changed save file.

Some games will work by doing that method yes. The different region versions usually don't update anything to their save file structure.

i didn't think you could do that on any game,no harm in trying i guess (but seems kind of pointless)