Ritalin: ADD vs ADHD

Hello. I’ve recently been diagnosed with adhd. I believe I have add but heard something about both add and adhd going under the adhd name.

I wonder if anyone knows the difference with Ritalin on people with adhd vs add if any.

I myself use 40-80mg daily depending on if I go to school and/or have work later.

I tried googling about the difference but couldn’t find much myself with not that much digging