From the very first one in 2014 to a 2023 "New Buell" they are physically and functionally identical enough not to matter.
The small number of 'updates' that happened in 2017 can be done easily and the mods that should be done, can be done to any of them. Dang good pic, I wonder where on RedwoodGardenBridges has been? I liked that guy
Funny though, I just snapped this pic of Ol' Bill M getting on the RSD built SuperCruiser in Sturgis a few days ago: