Well where the 40 games back up copies of the games or real copy's. If they play you already have a mod chip installed in your Wii.
Secondly if you don't have a mod chip you can chip it with any chip that would be the same with an american model version. The only differences is the programing on the system to read one type of format. A chip can override it and read any format. Just be carefull of bricking your wii with the wrong kinda software updates.
Nintendo-Scene Wii Serial Tracker
Should help you know which chip you will need for your system.
In closing. Yes find out what board and just order the chip you need. It does not matter if your system is jpn, pal, or USA the chips are the same for all models.