Yes, there would no doubt be some difference between an Ind PTO and a dry clutch PTO. The independant PTO has a heavy clutch housing, dragging in oil all the time so it would probably drag a small amount more. The other factor is the actual gearing that transmits power from the engine to the output shaft. Some tractors have a straight through design in the top shaft of the transmission and then step down at the rear of the tractor. Others step down in the front of the transmission. Perhaps some more are a straight drive from the engine right out the back... but I'm not sure about that. All of those designs will have a varying degree of loss. As an example, the old Fords would lose probably about 8-10 hp from the engine's gross through to the PTO. The newer, larger tractors would lose closer to 20 through their drivetrain. Two different designs; two differing amounts of parasitic loss.
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