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I thought the idea was that all the parts of a gearset were perfectly matched, and that there was limited interchangeability, even between components from the same manufacturer.
My bike has (had..!) Shimano Tiagra from new, and some replacements were needed.
The local bike shop offerered me the Tiagra or 105 front mechs. "What's the difference?" "A fiver", "No, I mean mechanically", "Nothing".
We've only got the 105 chain blocks in, they are identical, or slightly better, yes it's a fiver more.
New chain sir? We prefer to fit SRAM when we service and build bikes.
Confused? I should say so.