The Mazda 2.5 balancer is interchangeable with the 2.0 balancer, but the 2.5 is a few pounds heavier. Ford versions have a different timing ring. it also has a different harmonic frequency and should not be used with the 2.5 crank with the balancer removed and a lighter flywheel. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.