1997 GMC Jimmy Radiator blowing gaskets

I am currently in a dispute with an auto repair shop. Under his recommandeation, I replaced the radiator in my Jimmy, not that there was an issue but he said it was old. Immediately after the replacement, the intake manifold, then a few hours later, the head gaskets were blown. His technician told me at the time that the new radiator had stronger flow and higher pressure and this blew the gaskets. The chief mechanic of the shop disputes this now. My question is, is it possible that what the technician said was correct and replacing an old radiator could increase system pressure and blow the gaskets? Thank yoy in advance for your reply