ok the 2001 mazda 626 was also a ford Probe if i am not mistaken, but if you wanted to you can literally do any engine swap in the mazda it would just take modifications and work, my suggestion as a Student becoming a mechanic is to stick with the 2001 626 engine otherwise you might have to do some major modifications, the Ford Probe's 2.0l would also work easily since it was literally a mazda rebadged as a ford with the same engine and chasis also the Mazda MX-6 had the same engine you have so that would also be a great choice. but with money you literally can put any engine into any car, if you have any other questions just ask hope this helped.
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