You got them right.
598 looks quite distinct, 650 not much so...
Sorry! When I began composing, your post wasn't there.
The only time you can't tell an HD 650 apart is when you're looking at the HD 600 or the HD 580 (that classic discontinued model, which was rechristened the HD 600 iirc) along with it in that kind of a picture.
In this case I couldn't tell between 600 and 650 so I looked at your signature