i watched CL in person every one of his starts. They aren't even the same type of qb. Long was no runner but every single time he dropped back to pass everyone knew it was going to be a completion for 15-20 yards. It was a given. Long tossed for 455 yards in a bowl game. He would have easily won the heisman if it weren't for the once in a lifetime dual sport Bo Jackson who played both in the major leagues and in the NFL. Jack has a ways to go. Long is a legend.
Bo wasn't a two-sport "star" when he won the Heisman, and it hardly figured into the voting.
Chuck COULD tuck it, and on occasion, he did. He had an exceptionally quick release, and some definite beef on his OL. His backs, through his career, featured Eddie Phillips, Owen Gill, Ronnie Harmon, David Hudson, Norm Granger, et. al. He had no game-breaker deep threat on a consistent basis, but Early, Robert Smith and someone else occasionally made a game-breaking play.
Similarly, Rudock can tuck it and, on occasion, has done so. He has decent release, some decent beef on the OL, and his backs are certainly showing themselves to be capable, although his FBs are just glorified TEs, whereas Hudson and Granger were good ball-carriers and pass-catchers out of the backfield. Game-breaking receiver-but-not-yet-consistently-doing-it? Check. Good possession receiver who can make the occasional big play? Check.
Biggest difference is that Long had GREAT TEs who were good for a couple big plays a game. The potential is there now, but it hasn't manifested yet.
Biggest similarity is that both had KF as a coach in some capacity.