Are you sure about that? Could you explain why not?
It's no different to flashing a rom cooked from another cid. Of course jelly bean won't boot on older hboots and vice versa, but that's the only limitation as far as I can see.
Infact, I have cid HTC_001 and hboot 1.28, I'll try the backup for 621 you have listed for a scientific test.
There's a button for that, plus you owe me one from yesterday LOL - only joking. You must remind the users to flash the new hboot firmware version for HTC__621 from here
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