Difference between youtube and vimeo presets?

I produce videos that I always post to Vimeo, so I usually use the Vimeo 1080 preset. I made some new ones which I plan to offer more publicly, so I considered putting them on Youtube as well. I planned to export them from Premiere Pro twice, with both the Vimeo 1080 and Youtube 1080 presets. However, on closer examination, I couldn't see any difference between their descriptions at all.

Is there actually any difference between those presets (maybe something under the hood) that is not included in the descriptions? Or are they actually the exact same thing? I don't know what the point would be of two separate presets if they aren't different somehow. (?)

Also, I'd like to confirm: I heard an expert once say that if I export with the appropriate preset for a site either Vimeo or Youtube), then that site won't re compress the video at all. I would just like to confirm that, if anyone knows for sure.

Thanks!