The body I am looking at says it is American standard specs, so I am guessing most terms will fit.
If the body has the vibrato mounting holes pre-drilled, you should measure the centre to centre distance of the two outer holes.

Mex bridges will be 54mm mounting and 52mm E to E string spacing, American bridges can be a range of sizes from 2-1/16" to 2-3/16" or 2-7/32" mounting screw spacing and have varying string spacing also between those distances (52-56mm). Fender has been all over the shop in the past 60 years with these measurements and it can get pretty confusing. However dowelling and re-drilling is always an option.

If it's not drilled, the only potential problem could be the opening for the vibrato. If it's routed for a USA bridge, a MIM bridge plate may not be wide enough to entirely cover the routing. It would only be a small gap, but it depends on how pedantic you wish to be. I know this from personal experience.

As for neck heel/pocket compatibility, aftermarket, non-fender heels tend to run slightly wider than a standard fender pocket.
You're then faced with either widening the pocket, or narrowing the heel. IME the heel thickness with aftermarket or kit necks also tend to run a bit thicker than a genuine/licensed fender neck.

This has been a contentious issue with some, but I prefer to fit the heel to the pocket so that a genuine/licensed fender neck could be fitted easily in future if desired, but that's just me.