As far as the screens go yes, F & F2 are interchangeable and there are quite a few to choose from.
Usually you'll se an "A" in there which is a split image rangefinder type.
Click on that link that Yash so kindly referenced. Dig deep and read up on that mir site then there is also the
site which has some beautiful reference shots of the F's and accessories.
One of the many pluses of the F is that the viewfinder (Photomic or plain prism) is free of clutter and any electronic data to beep and flash like a pinball machine. You might want to try a plain screen if a focussing aid is not necessary.