Depends on which year of Mazda you are talking about. The Mazda pickups from 1971 (or whenever they started selling them in the US) until (I think) 1993 were Japanese made with a Mazda engine. Ford also sold the "Courier" pickup which was just a re-badged Mazda.
Then in 1994 they switched. Mazda stopped importing trucks to the US and instead Mazda dealers in the US sold rebadged Ford Rangers as Mazdas.
I've owned one of each: A 1984 Mazda B2000 (Japanese built) and a 1996 Mazda B2300 (AKA a Ford Ranger.) I don't recall having any issues with the plugs on the 84 Mazda and I never changed them in the 96.






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