Ok, fair enough, it seems bizarre to me that here we have two jobs, both with 250gsm matt laminate, one feels as I thought it should (quite rigid, nice weight) and the other feels flimsy and more like the inner part of the brochure.
So, my follow up question is, as a printer, would you supply a client with two jobs each using a different paper supplier, when the quotes specified the same cover specs and they would be delivered together?! Seems mad, one feels totally different to the other, and they really shouldn't.