Confusion about NTSC and PAL versions

I collect 8-bit machines (NES, Vectrex, CPC464, C64 so far) and just bought 600XL and 800XL.

I found some large collection of games but they don't say anything about region.

Are there different version (NTSC and PAL) of games?

If there is how can the version be identified?

I got the packages from ftp.pigwa.net and also downloaded some games from atarimania. Atarimania does mension the country but is it the origin of the game studio or PAL/NTSC region?

I'm building the SIO2SD unit for playing disk images. What is a good DIY device for cartridge images? (I can make my own PCB boards and solder SMD even BGA)