He's asking becasue it says JDM info and engine swaps at the top.
But since this is the honda forum, and not many of us know much about Mazda's Ill move this to the mazda forum.
and,
The only engine that I think of that might fit would be the 1.8l DOHC Turbo engine from the old Japanese GTR Fammila, or the small V6 that come out in some versions of the old Famila in Japan.
Of course it would depend whether or not the enige in the new Protoge is from the same family, or if the chassis has anything in common with the old cars.
But then why do you want to do an engine swap on a brand new car?