First, the provenance. Lemokey is Keychron's gaming brand, offering keyboards and mice aimed squarely at the players of games rather than Keychon's theoretically more 'enthusiast' fare. Let's be honest, the differences between gaming and enthusiast keebs are pretty slight—and only really of interest because our Jacobs love to fight about it—but when it comes to gaming mice there should be more of a clear distinction.
Though Keychron does actually sell obviously 'gamer' mice on its own site (as well as this Lemokey rodent)...