Thanks guys! I thought it might be okay but I wanted to check. It looked like the wiring was pretty similar, but the colors were really difficult to make out on these cables. The slow speed isn't an issue since they're just being used for phone lines. I'm not touching the phones at all. I wouldn't touch these jacks either if the plates weren't using some weird system. All the stuff I have is the keystone standard, and these don't fit, sadly. I'll just rewire them.

Thanks again!