Christ-
Yeah, 4x100 is a very common lug pattern for '80s and '90s small cars. 4x100 wheels are mostly interchangeable, though you have to watch out for offsets and center bores.
'90s Proteges and Escorts all use 4x100 and 54.1mm center bores. Not surprising, since they share lots of suspension components. Civics and other 4x100 Hondas have a 56.1mm center bore.
Try this if you're looking for bolt pattern, offset, and center bore info:
Vehicle Bolt Pattern Reference
So, the Honda wheels with a slightly larger center bore will fit over the Mazda hub. However, the Mazda wheels may not fit over the Honda hub without a bit of machine shop work.
Even so, I'm playing this one safe by installing wheels off of an other 4x100 Mazda.