This is a silly resource pack that edits the Stonecutter and Grindstone to use full-block models, sort of like a lot of other older workstations did. The Stonecutter uses the textures from the older scrapped Stonecutter block, while the Grindstone textures are "custom" (edited from the furnace textures lol). It's intended to be used with a resource pack like Golden Days, otherwise these will stick out like a sore thumb.
Note that while the have different models, the hitboxes aren't changed, as such would be impossible for a resource pack. If you want to fix this, Nostalgic Tweaks has options in the Eye Candy > Block Candy > Custom Hitbox section that lets you mostly convert them to actual full blocks (aside from a LITTLE jank).