“The Ritva on Shabbos 24b says they are the same person. Yerushalmi also. It’s night likely that the bavli too was clear on that point but removed by censor.”
You probably mean 104b (קד not כד), but it’s not there, either. That is where Tosafos says that it’s not the same person. You didn’t point to a Yerushalmi, and I would be surprised if Tosafos missed that.
Now, the Ramban in his debate, as well as Seder Hakabalah of the Raavad, do say that our counting is 100 years before theirs. This may be because they are only referring to ישו הנוצרי and not to בן סטדא at all. Or perhaps, and actually unlikely, they conflate the two since both are assumed to be referring to the Christian founder.