This is fucking unbeliavable!!!!!!!

Liam has reused melodies and has especially reused samples plenty of times before. This is not that big of a deal.

All bands and musicians re-use riffs and melodies, usually this goes unnoticed because most people just don’t hear that kind of stuff.
If you make the synthesizer’s sound different, ad/subtract some notes and pitch it up or down it just sounds fresh and new. As long as the beats are different but same applies for drum sounds.

This is how a lot of bands get their ‘signature sound’