Well the post-war will be much different, surely, with the conflict ending at least an year earlier than OTL mean that the entire continent will be in a much better shape due to the less wast of men and treasure...so the social pressure will be lessened.
In any case, Wilson influence in the negotiation, even in case the US enter the war, will be not extended as OTL due to minor debt for the Entente and the lessened impact that any american force will have on the conflict...this will be extended on any post-war naval treaty.
Instead ITTL Russia will be a much more influential and active partecipant.
Russia is in a much better position as no caucasus front (sure not really vital and that expensive in term of men and material, at least comparated to other fronts, still less blood and treasure used); there is a lifeline between the Russian and her allies, so supply can arrive, making the situation for both the military and civilian less dire and finally there is Romania remaining neutral.
The Romanian campaing was problematic for the Russian as it extended their line and the romanians were more or less a drag, not counting that IRC, the loot from the conquest of Romania greatly helped the Central Powers (but this need to be confirmed).
The current Tsar will be history but with a less chaotic and catastrophic situation, maybe Micheal will accept to become the new monarch of Russia, still there will be big political turmoil and violence but a communist takeover will be much much more difficult...IMVHO it will end with a figurehead as Tsar and the real power in a strongmen hand.
While a big fallout between London and Paris due to wartime experience it's entirely possible, France fall to communism is much more difficult to digest due to a shorter conflict and the (probably) lack of a succesfull revolution in Russia; unless it was an electoral victory that gradually (or not) become a dictatorships or at least an authoritarian democracy.
Same for Italy falling to fascism, lack of Caporetto (and by this stage maybe even of the Strafferexpedition), shorter war and (probably) a somewhat smoothier situation at the negotiation and no russian revolution mean less 'food' for the fascist