When giving Rhot potions, is there a difference between the Lust Potion and the Corrupted Lust Potion? Does it affect the story?
Yes. There is a 'bad ending' sort of thing if you do enough corrupt things to/for the lizardfolk, and that is one of the many things you can do to obtain that ending (or avoid it and get the 'better' ending for the lizard tribe).