Nah you don't need to play them and I think this game's different enough that none of the skills will transfer anyway, but you shouuld play them regardless cuz they're awesome
The CSP/Procreate thing is mostly cuz I prefer drawing on Procreate when using my ipad, and then use CSP on PC for image editing. I didn't use textures in Blender at all, it's just a simple color ramp "toon shader" rendered at low res. Most of the assets like tiles/etc. are 2D pixel art but the characters & moving objects are pre-rendered 3D