Hendrik - The fundamental "tone" (frequency) of an engine's exhaust is exactly as you describe. And the frequency for different engines with the same number of cylinders running at the same RPM will be identical as you mention.
HOWEVER engine displacement, exhaust port design, exhaust manifold geometry, exhaust pipe diameter/length and other factors generate all sorts of harmonics of the fundamental frequency. This causes engines with the same number of cylinders and running at the same RPM to have entirely different "voices".
Example: A straight 6 with with a center outlet manifold (Dodge/Plymouth flathead 6) sounds very different from a Continental straight 6 with its manifold outlet between the #1 and #2 cylinders.
End outlet manifolds, split manifolds, etc similarly result in dramatically different exhaust notes from otherwise identical engines.
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Incidentally as a kid I could distinguish just by sound IHC, Mack, White, Chevy/GMC, Dodge and Reo gas truck engines. Likewise Farmall, Allis-Chalmers, Minnie-Mo, Ford, etc. 4 cylinder tractors. Hearing these engines run at antique truck and tractor shows brings back fond childhood memories(!)
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