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Regarding different size pistons, and weights... it's been my experience that the piston suppliers I've used supply their pistons to the ORIGINAL weight, no matter the size. This has been for near-stock sizes, say up to about 60 or 80.
Regarding the bent rod... now we see that at least one rod was likely replaced. I hope its weight was compared to the other 7.
Side observation/comment...this engine has had at least two recent 'rebuilds', and now going for a 3rd. And I see that a full-floater crank is still being used. I'm a little surprised, as I'd have ditched that crank and rods, at least two rebuilds back. I guess that's just me. I'd at least have an 8BA crank, but more likely a Merc or aftermarket crank. If cost were a factor (which at this point I doubt) I'd go for the 8BA, as my builder/machine shop guy hands them out for free. JMHO