There are multiple workflows for each:

• txt2img

• img2img

• inpaint

• txt2img controlnet

• img2img controlnet

• IPAdapter

They all have additional upscale nodes, which are disabled by default.

Just switch checkpoints if you want to use SD1.5.
Pony or Illutrious is SDXL fine-tuned, so of course it works with this workflow.

The version is controlled in:

https://github.com/jhj0517/ComfyUI-workflows/tree/master