Sadly that's a good question. The closest evidence I can find is:

Surveys: Awad et all 2020 asked 70,000 people in 42 countries the 5 v 1 setup and 81% said they'd divert it

Someone else did a VR version and 90% pulled the switch to divert

And there was a study where people could give electric shocks to real mice :( In that study, most people redirected the shock to a single mouse.

I wonder what percent of that 81% would switch their answer if the question was phrased such that they were the one that would die if they pulled the lever.