Would the Seat fittings from a late 97 NA fit early model NA seats?

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If the refurbished seats are from a 1.8, yes, the runners from your seat can be transferred. If the seats are from a 1.6 model, the runners will fit, but the seat will lack the screw fitment for the correct seatbelt fitting.

The seat belly pans are differerent.

Late car/1.8 belly plan compared to earlier car

And comparing seats with their covers on

You can swap the pans

Mk1 seat pan swap

I have a set of good 1.6 Mk1 seats to fit to a 1.8. The drawback is, normally to  fit 1.6 seats to a 1.8, you also need to fit 1.6 seatbelt latches, not only having to get the latches but also cutting the carpet.   Mk1 1.8 seats in good condition are harder to find because [a] there are less of them than 89-93 seats [b] there are 3 different styles of 93-97 seats [c] The flame retardant upholstery has rubbish wear properties, even though it looks similar to earlier models.   I haven’t seen a…

Or, get hold of early seatbelt stalk

And find the early position locating hole under your carpet. In most later cars, the threaded hold is still there, with a plastic plug. In some later cars, there is no captive nut, and you would need to use a rally harness backing plate (the thread will be a UNF thread correct for the Mazda bolt that comes with the stalk)

I use early latches in my 1996 car which has been fitted with factory option seats from an early car.