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@gbj_tester
Yes and yes, that's the most common cause of creak from square taper cranksets.
Some shops haven't caught up with the programme and are still installing square tapers dry, this means they don't go as far onto the taper for a given clamping load, which means the normal force on the interface is reduced. If everything is greased (tapers, threads, bolt head underside) and the bolts are tightened to ~24Nm (for M8 crank bolts), they should be quiet.
BB units with plastic cups can get creaky at the interface between the cartridge housing and the plastic cup, because the plastic creeps, but cranks moving on the tapers is a much more common cause of noise emanating from the BB.