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Why would you have to take the USMLE? Some path residencies are probably happy with COMLEX alone.

With a good story about why you want to switch, and path letters of reference, you should have a decent shot. There is a funding issue with second residencies, but that's not always a huge issue. You can read about it here: Medicare’ Payments for Graduate Medical Education: What Every Medical Student, Resident, and Advisor Needs to Know

Spend some time working with local pathologists and get LOR's. Better if these LOR's come from those involved with a Path GME training program, if possible. Apply and see what happens.