question about vin#/getting car inspected with different engine

i understand that, but im replacing the piece the vin number is on.

its just that lets say i just replaced the panel that the vin number is on, would i still need to get a reconstructed title? I would think not.

also i would think a reconstructed title wouldnt count if you replaced all of the panels separately, but it does if you buy them all together, am i correct?