Bear in mind that film transport noise will be different depending on how the last owner stored the camera, how heavily it was used, whether it has had a CLA, etc.

Shutters are likely to be much the same across different examples, providing that their speeds are accurate.

Those soundproof "blimp" arrangements were available for Pentax as well, I've seen a photo of one for an MX and heard that they existed for the ME and possibly earlier models too. Very rare now, and usually mistaken for an unusual ever-ready case.