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As noted in Airplane Aerodynamics by Dommasch, Sherby, and Connolly, 1967, Pitman Publishing Corporation, New York... It is a relatively simple matter to fit to an engine a large supercharger that is capable of providing excessive MAP (manifold absolute pressure) at full throttle at sea level. Ascent to altitude permits opening the throttle to compensate ...


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Those engines have different valve configurations, which mean they "breathe" differently. Better breathing supports more RPM's before the engine runs out of puff, so the most probable cause is the better breathing in the one that revs higher.


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