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Patient searching of the classifieds here often turns up quite a lot given how quickly people (myself included) decide they need longer/shorter cranks or larger/smaller rings and then get rid of the old stuff! We're all for the circular economy here on LFGSS.
But just to be sure, does anyone know if 5800/6800 rings will physically fit 4700 cranks, and if they sit flat am I ok to assume that's all that's needed and a mismatch in the 3d part isn't going to be structurally relevant? Annoys the hell out of me that cranks that all look (on the surface) to be identical have mm-level differences ): On that note, although the 5800 cranks don't fit perfectly with the 6800 rings, Shimano indicates those can be swapped? Wondering if it's the 10-11 speed difference.. although those shouldn't affect chainring widths or BCDs?
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youClown
All of those cranks have unique sculpting where the arms meet the big chainring. Some combinations will physically fit (but look wrong), but Shimano doesn’t endorse anything but an exact match.
Have you actually found original 5800 or 6800 chainrings for reasonable money? I couldn’t last time I looked. Your best bet might be flat rings from Ali Express etc.