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I would say under a general rule of law, if they are two individual boards in any way shape or form (That would be attached via a bracket, screws, zipties, or male-female connections each part is individual.
That said, #1 is HGT in my opinion
#2 (The one with tantalums) I can't tell what's on the back. A heat sink? Remove that and run with HGP
#3 (The one with transformers) ... Remove the three largest ones. Not sure if matters if the final tiny one is there or not but I'd run with HGP with that if you do so
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