The Royal Shine is different. It has an additive to make the surface "tackier".

Same with the Royal Compound versus Rough Buff, and the Royal Compound has also been tweaked so as to not leave the "powder-like" residue that would sometimes happen with Rough Buff.  For best results I like to finish the "buffing" stage with a damp cloth.

Whether or not you see a difference (to the naked eye) depends on a lot of factors; however, in my mind a tackier surface should be a plus since we rely on friction to allow the ball to change direction and drive through the pins properly.

Glad you're doing well with the Nexxxus.  Keep throwing strikes!