ADHD is an executive function disorder and you could usefully label it as being deficits in these skills:
* Delay your responses to situations long enough to come up with a good and controlled long-term plan * Pattern-match past situations onto the present situation to guide your current response * Mentally tell yourself what to do and have it stick * Manage your emotions towards your long-term interests * Imagine and evaluate multiple possible future outcomes
There are other ways to describe it - e.g. I didn't mention short-term memory - but this is the flavor.
ASD is completely different. ASD is (I believe) a predictive processing disorder. Normal brain processing involves each layer of the brain predicting what the lower layers will report, and "blending in" all of the minor mistakes in the predictions. Large mistakes are literally surprising and uncomfortable, and push the brain to learn (i.e. change its predictions). Normal brains are constantly ignoring small prediction errors and are very tolerant of ambiguous, uncertain, or new situations. An ASD brain cannot blend in the minor mistakes as well, so it spends a lifetime perpetually surprised and overstimulated by every event that is even slightly unpredictable, and is fairly intolerant of ambiguous, uncertain, or new situations.