There's layers to this one - it's creator connection as TomSka created Crash Zoom and also served as Eddsworld's showrunner for several years, it's hairstyle connection obviously, and it's also trait connection in multiple ways - both are artists, both have superhero forms (or at least, Edd does, Ell is technically self cosplaying here).

Really fun crossover pairing, all things considered. These two are such similar characters.