Interesting question.. and I don't know for sure, but I don't really think so. Didn't measure but just eyeballing it, seems to sit in the same relative position. I looked at a bunch of my build pics and none of the ones I can compare are exactly the same angle, but if you look at the surrounding underhood items, the engine seems to be in the same position.
Vortec 7.4 in the '94 3500HD:
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Vortec 7.4 in my previous '96 C3500
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Don't let the master cylinder reservoir throw you off; the HD has a much taller reservoir. Also, can't use the fan shroud as that's a taller HD-specific part.
Look at the other things around the engine for reference. Particularly, the distance between the rear of the intake manifold and the recess in the firewall for the engine. Looks pretty close to same, to me. Probably the best point of reference I notice is where the air intake tube/MAF sensor sit in relation to the A/C accumulator.
Richard