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MAKE SURE YOU ASK!!!

I bought a crank, pistons and rods with rings and bearings from Scat last summer. ...
So I got curious and weighed them. They were off +/- 5 grams on the pistons alone.

Wow, that is pretty far off, IMO. Most (but not all) of the reputable stuff is within +/- 1 gram or so from each other, that means the lightest and heaviest in a set could 2 grams different. And that is what a precision balance job will fix.

I have seen factory connecting rods be 20 grams different from the same engine! That is way too much for even street performance, IMO.