Anyone know how to make a Cupcakke remix on BandLab?

Ok so I’m wondering if anyone knows how to make a cupcakke remix on BandLab at all? Y’all know what I mean 😂

I’ve even seen people do it on CapCut and on ableton they make it so easy just add in instrumental parts to the original track where they replace the vocals or other stuff. But I’m a beginner and want to learn how to do it. I don’t know how they get the cupcakke lyrics to match up exactly the right tempo/pitch as the original song they’re remixing. Any hints would be appreciated! Thank you