Ultimately I’m calling on any Charlie XCX fans here to help me work out if this statement on the Wikipedia article is correct.
The wikipedia article mentions there are two mixes of this song; one that was originally used in the film The Fault in Our Stars, the soundtrack for the film and the music video; and another that is for a music video in Japan and appears on the album Sucker.
The issue I’m having is I cannot find this supposed second mix. I have found the Japanese language variant but no such specific music video.
You can notice the difference right at the beginning after the “boom boom boom clap”. The beats in the album version sound more aggresive while the soundtrack version is more tender. Not an expert in instrumentation, but there are definetely instruments that can be heard in the chorus of the album version that are not present in the soundtrack version as well.