It is not the same thing at all.
In a sketch every detail in the image was intentionally put there by you. If you ask a generative AI model to draw something for you, it will invariably add all sorts of details of its own which you did not explicitly ask for and which you might not have seen, but which might influence IDers.
See the discussion in this thread: https://forum.inaturalist.org/t/use-of-ai-upscaling/52724/