It doesn't change, but you're more reliant on damage coming from your magical attacks as it directly boosts up your shadow damage and your frost damage. This requires a certain gearcheck to be passed. Normally you don't wanna do it till you at least have the four piece tier 9 set or two piece tier 10 set. Otherwise 17.0.54 is better for you.
The rotation doesn't differ unless you have reaping or not.
Reaping will make you use ScS in the second part. Without reaping, you're using 2xBS. The rotations are still fine the sticky.