I have a stack with one N3024 (which is the master) and one N3024P. Now I need some more ports, so I want to replace the N3024 with a N3048. What are the correct steps to accomplish that?

Do I have to add the N3048 to the stack first, and then remove the N3024? Or can I simply remove the N3024 first, and then add the N3048?