What is the difference/meaning of FIXCAT categories

IBM.Coexistence.z/OS.*
IBM.ProductInstall-RequiredService
IBM.TargetSystem-RequiredService.z/OS.*

Coexistence I understand but the other two are slightly confusing.

Would I need all of them on my down level systems when installing a new release 
of z/OS?
Currently running 1.13 and 2.1 in a plex, will be adding 2.2.

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