I'd say that Sync II is easier in rockband, mostly FC-wise, and some 5starring/passing wise. The intro riff is about equal in difficulty, and the rest of the song is pretty similar, except for the fact that in GH80's you had to strum everything, RB version is hammer-able. Also, RB version left out the ending solo, only part that made the 80's version a challenging FC.
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My XBL Gamertag - m4tth4x
Drum Goals-
Get 1st place on a song [X] (Even the Losers and Here Comes My Girl (Live))
Guitar Goals -
FC Chinease Democracy [ ]
FC Godzilla [X]
FC Chrion [-1]
FC Mud On The Tires [X]
FC Tripolette [-2]
Add me on XBL if you wanna play RB/GH