Just a For What its Worth post.
I weighed the pistons, pins, rods, etc to see how they matched up with the Balance sheet from 440 Source.
Note: I used the same numbers for oil weight and balance factor. The locks and rings measured the same when I checked them. There were some variation of piston and rod weights, but they were fairly small, less than 2 grams max.

This is the 440 Source Balance Sheet Info:

440 Source Bob Weight Card
Piston and Pin 755.8
Rod Bearing 47.8
Rings 57.7
Rotating End 528.8
Locks 4.4
Oil (each) 2
Rod Pin End 241.5

Reciprocaring Total 2118.8 Rotating Total 1157.2
balance Factor % 50
Reciprocaring Total ½ 1059.4 Bobweight Total 2216.6


My Measured Numbers:

Piston, Pin, Rod End 998.69 Rod Bearing 47.8
Rings 57.7
Rotating End 528.46
Locks 4.4
Oil (each) 2


Reciprocaring Total 2121.58 Rotating Total 1156.53
balance Factor % 50
Reciprocaring Total ½ 1060.79 Bobweight Total 2217.31

diff 0.71

My Individual part measurements:

Ref Number PISTON PIN TOTAL
1 598.5 158.1 756.6
2 598.1 158.3 756.4
3 597.3 158.1 755.4
4 599.6 158.2 757.8
5 598.3 158.2 756.5
6 597.3 158.2 755.5
7 597.9 158.3 756.2
8 598.9 158.0 756.9
AVE 598.2 158.2 756.4


ROD WEIGHTS
Ref Number TOTAL BIG END PIN END
1 771.0 528.3 242.7
2 770.7 528.7 241.5
3 770.4 528.5 242.1
4 770.5 528.8 242.9
5 770.6 528.4 242.8
6 769.6 528.4 241.5
7 771.1 528.5 242.7
8 770.4 528.1 242
AVE 770.5 528.5 242.3

By matching the light pistons with the heavier rods, I minimized the variation in the reciprocating end (piston, pin, small end of rod) to an average weight of 998.7 grams with less than 0.5 gram variance) The lightest combination being 0.29 gram less, and the heavy combination being 0.41 gram more.

Note that the slight difference in rod end weights could just be a slight difference in leveling the rod balance fixture. We are talking weight differences less than half a sheet of paper (A 8-1/2"x11" sheet of printer paper is about 4.5 grams.)
From this information, The Balance measurements from 440 Source look good.
I would have to send the crank out to have the balance on it checked, but I'm going to use it as is.