Thinking about it a bit more, the actual/physical aperture of the 100-400 Mark ii at full extension could be something like f/5.9...i.e. above f/5.6 but closer to f/5.6 than f/6.3...and it might not really be 400mm as others have suggested...so taking those two things together it is possible that 100-400 Mark ii at full extension might have the very same physical aperture as the RF 100-500 at that focal length.
Edit in italics for clarification
Edit in italics for clarification
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