Will my Japanese GBAs work with european chargers?

I have recently found 2 limited JP exclusive GBAs I've been wanting for a long time and they're currently on the way to me. I honestly forgot that charger differences are a thing though. One of them is an SP that comes with a (japanese, looks to be the AGS-002, doesn't seem like it can't be plugged into a european outlet) charging cable, the other is a regular GBA that I plan on modding with a Funnyplaying USB C battery pack.

1. Can I get a european GBA SP charging cable and use that for the SP or will there be an issue with the voltage etc?

2. Is there anything I need to keep in mind regarding the USB C mod? Specific cable I need to use or might it even be incompatible with a JP GBA?

I would really not wanna fry these GBAs as they're quite rare and I spent a lot. Thanks in advance.