This tutorial takes a look at the practical differences between a custom prop (Building Prop) versus a custom static mesh actor (Bulding Static Mesh) in Unreal Editor for Fortnite. The tutorial shows that in Verse code, both a custom prop and a custom static mesh actor are seen as creative_props and can be manipulated as such.
https://dev.epicgames.com/community/learning/tutorials/ZeMa/the-differences-between-a-custom-prop-and-static-mesh-actor-in-unreal-editor-for-fortnite