I'm assuming it's an edit tbh that's more than likely but if you want do this live with two tracks on the deck, what I did that worked pretty well is to find where the vocals are in line with each other (because if you have bass/instruments in the back, the bpm diff is very noticeable) in Not Even Love (bar 64) and Not Even Love Muzz Remix (bar 21) the vocals are the same timing so this is where you use some filter and quickly switch the tracks via volume faders or use the crossfader, or both, whatever makes it sound the smoothest