Thank you for your question. I am going to assume that we're dealing with a FP contract.

If we're in a cost scenario, it's another matter altogether- somewhat simpler since 52.216-7 essentially

renders most if not all compensation related costs allowable.

FAR 22.1002-3, 22.1008-2 and 52.222-41(f) address section 4(c), as does 29

CFR 4.1b. SCA extends down to all layers/levels of subcontractors. Anyhow,

in this situation let's presume that the CBA is still in effect as a WD- and

under FAR 22.1007, unless the contracting officer has changed WDs, it still

would be. So any terms specifying an increase in pay or benefits would be

effective and binding on the employer, and presumably are passed on to the

prime. FAR 52.222-43 allows a contractor to seek equitable adjustment

if/when those costs increase as a result of being featured in a wage

determination. Based on the above, I would say that yes, these

increases are allowable under 52.222-43 provided that my assumptions are

correct.