I'm certainly not a propagandist (basically I don't care much about what do you believe) but why do you think that those versions are that incompatible? Turn one: Russian forces came to Bucha and, cooperating with local guys, kill some pro-Kievan militants. Turn two: Russian forces leave Bucha, Kievan militants came in Bucha and kill some pro-Moscow "collaborants". Turn three: Zelenskiy got money from western partners and make stupid show (by staging and adding fakes) from all this mess.
What I do not believe is that Russian or Ukrainian regular forces were able just to kill random civilians on streets, or that Kievan regime was able to say truth about anything.