Whats up, i have a few questions abouit the back workouts, i need some exercises that would cover the top, middle and bottom of the back, i was also wondering if there is a differece between seated cable rows, and standing rows , also does the grip mean anything , for instance , if i do close grip for seated cable rows, an close grip for the standing bent over rows, is it all the same or not

my work out now consist of the following:

lat pulldowns 3 sets
bent over rows wide grip, 3 sets ,
back extension
iso- lataral pullover machine

please give me a bunch of exercises so i can switch my back workout up for each week, thanks