For your future videos, consider fleshing them out just a little. Add some sort of audio commentary, where you discuss the differences, title cards that introduce the comparison and that also include the name of your channel, maybe a burned in watermark and a closing title card with the channel’s name, thanking people for watching and asking them to share and subscribe.

I know it’s extra work but that way, your videos are definitely transformative and those additions will strengthen your ability to issue claims with Y.T. when others steal your clips.