[mothered]

They are all owned by the same parent company and I think they all have the same support chat service thing.

Yes, I'm aware of their parent organization/manufacturer, namely Luxottica Group.

Rather than being repetitive, @Ordnael92 has explained It perfectly below.

They operate in similar (if not identical) ways, but their databases don't seem to be shared. I hit one after another in rapid succession, no problem whatsoever.

I can confirm they do not operate with the same database, which Is why SH & Ray-Ban have been hit so many times In close timing without Issues.