gsr header on ls

Does anyone know if the upper section of a stock gsr header will bolt up to an ls head and the stock lower section of an ls header? If so, is the gsr header match ported to the head or larger ports than the ls header? Any info would be helpful.

N/A 94 LS

IMO it would be a waste of time. , But i don't think the two parts of the manifold will bolt together, but the top part will bolt to the head.

thanks for the info whtteg

Also I think the 96+ GSR manifolds will fit the LS. Not 100%sure about that but seems like I heard that somewhere, but the 94-95 will not.