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In The Empire Strikes Back, is that the back of David Prowse's head that we see in the hyperbaric chamber before Darth Vader is fitted with his mask?
Yes, it was Dave Prowse playing Vader in that scene.
He had the prosthetics adhered to the back of his head for the shoot.
Here is a rare photo of Dave on set in the meditation chamber - I believe it comes from the recent J. Rinzler 'making of' book.
I'm not sure about Empire (it may have been Bob Anderon), but the unmasked Darth Vader (Return of the Jedi) is not played by David Prowse. The actor in question there is Sebastian Shaw.