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Does Yamaha bb734a and trbx604/504 have the same preamp?

I was looking at the current offerings by Yamaha and was struck by the similarities between the bb734a and the trbx 604/504. Control layout seems exactly the same, and so does the rear compartments. Could it be that these models all share the same electronics and the difference is in body shape, neck and pickups?
If anyone could help out with a picture of the guts of either of these models I would greatly appreciate it.
Thank you very much.