I would think that it's different, only because you have the potential to alter what could happen.
Does traveling back in time guarantee that someone would react the same way in the same situation even?
Maybe, maybe not, we're entering the realm of Schrödinger's cat as well as how time travel would actually work.
Do we create some new branched timeline in travelling back?
Do we enter an alternate universe entirely?
Do we have a time machine where paradoxes are a problem?
And the list can go on.