Actually it was a same franchise with new developers.
EA07 and C09 are two completely different games by different developers. The Brian Lara series shared common heritages but for the purpose of developing the games, I doubt there was much crossover in terms of the coding, but whatever there was they shared a common heritage but they're again, quite separate games, from what I know.
Codemasters are no longer involved (or exist) therefore, it's being built from scratch. There's nothing to share, because it's a defunct business. There's most likely crossover in personnel perhaps who bring their on IP that's no copyright, but for all intents, it's a new game, new people, new take, new codes, new everything.
It's a good thing. Lots of studios do this. ACI and ACII shared the same staff and studio, but both were built "from scratch" by Ubisoft. ACIII has again, been built from the ground up utilizing a new engine, new characters, new animations, the works. There's nothing to fear with people stepping outside of whats already been done and forging a new direction.