Hamlin is a Gibbs driver and runs upfront. KB2 is a Gibbs diver and runs mid pack or wrecks most of this year.
The team approach and the cars is probably pretty equal. Sims would provide some differential in set up based on drivers preferences.
The one variable would be the driver, or the driver / team relationship.
I think KB2 is a great driver, but ever since the practice sessions stopped for the most part he has lost his edge imo