IAh Hawk 982 spare parts interchangeability?

Hello all. I was interested in the hawk 982 shotgun due to very limited funds, and I was curious if the smaller parts are interchangeable with this gun and the 870. By smaller parts I mean things like..

Extractor, ejector, springs and pins in the bolt and trigger assembly, etc. in case something ever needed to be replaced or upgraded.

Also. If the rear ghost ring sight is removed, is the receiver drilled in the same spots as an 870, enabling me to add a scope pic rail or anything like that? Thanks!

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IAh Hawk 982 spare parts interchangeability?