Yup you can play PAL games with NTSC bios and NTSC games with PAL bios. That is as long as its a good(uncorrupted) bios.
scph1001(this is NTSC) and scph7502(this is PAL) are the recomended bios, but it doesn't matter which you use except for one or two games that some people have trouble running without a certain bios.
scph1001(this is NTSC) and scph7502(this is PAL) are the recomended bios, but it doesn't matter which you use except for one or two games that some people have trouble running without a certain bios.