Given that there are possibly multiple iterations of axetale, how different would a version of axetale sans who never experienced an attempted genocide run be when compared to normal axetale sans when it comes to personality and history?

A Sans that didn’t experience a genocide run wouldn’t have gone after Papyrus when he followed Frisk as she went to confront Asgore, and wouldn’t have been present to stop Flowey from taking the souls the first time. What would have resulted from such a scenario would have been a classic neutral run as we know it.