New competition model comes with the following:
HPS head with stronger pitch links.
2mm CF sides instead of previous 1.6mm.
Supposedly a new motor mount, but the difference is not obvious.
New dampened tail rotor like the 500.
Aluminum CNC tail side plate with CNC pieces that help align the tail rotor to the boom.
Lighter tail boom.
Quick canopy release
Canopy saver (rubber molding to protect canopy edge).
I think that's it. You can buy any of these parts for the normal 630.
How much lighter the tail boom is from previous has not been disclosed. However, I did notice that the new Comp 630 is 100 grams heavier than normal 630.