I agree with USAFret If the PNY is running well then just add the Samsung as extra storage. But if you are determined to install the Samsung, I always go for a fresh install. That way I know there wont be any issues as far as that is concerned. I do make backups of the current drive before, you know, just in case.
Maybe someone with a little more experience can chime in because I'm not 100% sure if there are any issues related to SSD to SSD clones.