Since you are swapping from the same generation series, you likely will be fine. But like volkgren said, I always just start with wiped out drivers and a fresh install direct from Nvidia to fool proof any rare problems that might arise at the worst time (like during gaming and getting a "Display driver error, application stopped" crash notification). Yes, it happened to me when I just swapped out a GTX 680 for a 970 and kept the same drivers. Worked fine for a while then crashed in a game. Even though those were different GPU generations and yours are in the same generation, I'd still start fresh.