Cof rework
Honestly, the Sorelians are definitely the more “radical” faction in the Bloc Totaliste. The ideas of Sorel are wild, and without revealing too much, the KR Sorelians essentially believe that the revolution was stolen from the workers by a bureaucratic-intellectual caste, and that a new, uncompromising, violent revolution is needed. They see themselves as the ones holding the key of true syndicalism™️ and are ready to go against anyone that would stand in their way.
The Jacobins, or rather what we will replace them with, are openly revisionist and believe Syndicalism was only the first step, that to protect the revolution a new, strong ideology is needed. They’re mostly men coming from inside the system. It’s a less frenzied ideology, though they’re not prone to compromise either.
If we had to make OTL parallels, in vibes only and not ideology, the new “Jacobins” are the DDR, a squeaky clean, bureaucratic, technocratic, totalitarian state, the Sorelians are Red Guards’ era China, a totalitarianism enforced by the messy, ideologically frenzied masses.
You’re absolutely right that they hate each other though, the Sorelians are seen as a bunch of infantile thugs by their Jacobin “allies”, who in exchange are seen as effete bureaucrats that will be second on the purge list by the radical students and disappointed workers making up the ranks of Sorelians
Guesde is the biggest influence on one of the major parties in France, the Councilists, as per Rnk:
Most of the factions borrow from Marx (or perhaps rather, borrow from Jules Guesde, who was Marxism’s entry point in French politics), but yeah the reworked RadSocs will indeed be the more committed, orthodox Marxists. They’re dubbed the Councilists, because they believe that local workers’ councils should take a more important/primary role instead of the unions, believing unions have a tendency to fall into base corporatism and are the cause of much of the bloat of the Commune and her inefficiencies, while excluding important parts of the population from much of decision-making.
The socialist majors in the mod, namely the UoB and CoF, have somewhat old content and therefore don't have as many flavour events showing various facets of daily life and how they run. Most of the time they're certainly more democratic than the USSR was, but that doesn't really make them a paradise. This is still the 1930s, and the attitudes present in that period would still be present in both of those countries at least to a degree, but the socialist governments are likely to make more of an effort to combat them. In the case of racism specifically, combatting it also aligns with the socialist powers' goals of anticolonial agitation against both the Reichspakt and the Entente, so there's also a pragmatic angle to it.
Britain for instance has a big issue with a very authoritarian and otherwise horrible person in Mosley nearly at the top of their government, and that is something they will have to resolve one way or another in their rework, along with their backsliding away from democracy.
France in their rework has an issue with their democracy being rather dysfunctional, as their legislature is comprised of delegates from both councils and unions, and there are various inefficiencies connected to this setup, as you can see in
this teaser in the part about
The Commune and her Institutions. All five paths for the Commune will have various ways of dealing with this issue.
As for why both seem to be more successful in achieving their goals than the USSR was, one reason might be that their civil wars were shorter and far less destructive and also that they were far more industrialized from the outset than Russia was.
I hope that answered your question at least somewhat.