can you swap the 5.3 lmg's intake manifold and throttle body for the 6.2 l94's

I do not know how you can swap components that are made for their respective engine's successfully. Perhaps there are performance packages to purchase in the aftermarket, but you cannot just swap one part for another without making sure it's applicable. And these components are made for their respective engine's. Additionally, not sure of any benefit without making sure you are utilizing something to upgrade the specific engine performance. I would suggest consulting a local shop near that may have experience in modifications. https://repairpal.com/auto-repair-near-me