Stig. this is a 17bis with narrow cowling and an RFC 24bis with standard. You can only see the difference from the side.
Both the 80 and 110 LR engines had 9 cylinders, main difference I think was that the 110 made the machine nose-heavy.
The Russian Nieuport in Clint's photo is a 24bis with rounded ailerons (I called it wing tips). Also the seller is based in Russia (note the "5" and "3" again).
https://en.wikipedia.org/wiki/Nieupo...right_side.jpg
https://flyingmachines.ru/Images7/01...port2/24-1.jpg
Regards
Nick