Sorry to be a pedant but whilst the first two are Putilov M1902 that otehr piece with the Chinese crew is most certainly not a FK 96 n.A, it's not even a recognisable Krupp piece.
Mr Swales who made all the lovely guns for Foundry and latterly Copplestone, was usually pretty accurate in his modelling. I think this is just a generic gun to give the Chinese soem support. Pity really as had he done a 75mm Krupp export piece he wouldhave scooped the pools for all manner of potential users, Turks, Chinese Japanese, Belgians etc etd.