Mostly as above.

3spd, 4spd and trimatic are the same for HQ-WB.
TH400 are unique.
TH350 are unique.

Then there is the different lengths between sedan/coupe/wagon and ute/van/tonner.

Which results in 6 x different crossmembers plus the one from a HQ sedan and coupe for the MC7 Muncie.

You can easily turn a passenger one into a commercial one by knocking the 4 x weldnuts off the ends, cutting the ends off it, redrilling the 4 x mounting holes and tack welding the 4 x nuts back on.