Question concerning types of patches

[solomon420]

I have a question concerning patches. I have noticed that are several types of patches out there. a PAL/NTSC selector, Trainer, and Protection Patch. But I have only seen the protection patch on very few patches. Is there a chance that a PAL/NTSC selector and Protection patch are the same, and just labelled differently? If not then there are not too many protection patches out there. I know about the codes, but patches are sooo much easier to deal with than typing in a crap load of codes. Any help in appreciated. Thank you.