Speedmaster Mid Case And Case Back Compatibility / Interchangeability

This may be a dumb question, please excuse me if it is common knowledge, but does anyone know if 145.022 mid cases and case backs from different case manufacturers are compatible with one another and can be interchangeable? i.e. can a 145.022 HF mid case be matched up with a 145.022 CB or 145.022 CRS case back?

Additionally, would it matter if the mid case and case back were produced years apart?

While I am aware that finding a complete and originally mated empty mid case/case back is ideal, I'm trying to source a mid case and case back for a project but finding a complete empty case has been challenging lately so I'm asking in the hopes of understanding my options.

In my experience all case backs fit all mid cases.

Thank you very much!