Jason Collins started for that team and played around 24 mpg. He is a better rebounder than Johnson, but not much else. Kittles was an excellent three point shooter (especially in that time). A bit better all around offensive player than Bradley but not nearly the defender. Again edge to Boston. Richard Jefferson was significantly better than Crowder though. Much more complete offensive game, a better rebounder, and an underrated defender. Kenyon Martin and Al Horford are completely different players stylistically. Martin was a much better interior scorer than Horford, but had no outside game at all (which fit more that year). Martin was a better rebounder. Horford is the better defender, but I'm not sure Horford can really guard a guy like Martin in the post. The game is just so much different now. Boston has a better bench but Harris, Rogers, Johnson, Williams, and Mutumbo were all cagey veterans that could still perform at times in clutch situations.
Taking the PG's out of it, I'd say the teams were about equal when considering the style of play in the time period the teams were in.