Answered: NEC ECC: Contractors Proposal Increases Cost Option C

It doesn't sound like it.

For the side entry treatment /table tops the PM would have to instruct a change to the Works Information (NEC3) / Scope (NEC4).

Providing the PM then instructed the further change to the material to increase durability, then that would be an additional instruction changing the WI/Scope and hence an additional compensation event on top of the original one.