ostris/watercolor_style_lora_sdxl
Adapter vs stabilityai/stable-diffusion-xl-base-1.0. ostris/watercolor_style_lora_sdxl is a LoRA adapter, not full weights: rank 4, on unknown modules (560 adapted matrices). It modifies stabilityai/stable-diffusion-xl-base-1.0 at load time.
1 other repos hold byte-for-byte identical weight files.