Flash Linker Roms

[TeaWu]

Thank you very much for you help Areku.
On gamecopyworld.com, I saw an "USA2Euro Patch" for a GBA game. I thought you can use every game with every GBA. Wether it is Jap, Euro or USA. But what is that Patch for then? Do they ve the same protection for the GBA games as for the GameCube? So that you can't use an USA game with the Jap or Euro GBA?
That is very important for me cause I bought my GBA in Hongkong so I ve no idea wether it is for Japan or USA. But on the Net they always have different Rom Versions (Jap, Euro, USA).