The Ford Courier is a rebadged Mazda. After the Courier/Maz varient died, Ford and Maz both made their own unique trucks totally different from eachother in the 80's into the early 90's. Ford's was the Ranger, Maz was the B-series. Ford redesigned the Ranger in '93 and mazda took it and rebadged it in '95 for north american sales. Ford's relationship with Mazda is strong...many of Ford's top selling cars are infact Mazda underpinnings. Rumor as of last week is that relationship between the two is dwindling.
In short, Ford was a mazda. 80's were two totally different trucks. Recent years, Mazda is a Ford. If that makes any sense. lol.
Your 2.5 or your friends 2.3 are both straight up Ford.
Just found this... http://en.wikipedia.org/wiki/Mazda_B-Series
Confusing the Maz/Rangers are. lol.