The technical answer is that one value has been changed in the WBS. Other than that the scenarios are identical.
As posted by others, no they aren't.Locked and Unlocked scenarios are completely different.
The civs you can choose from are different and the gameplay will definitely be different. It is only one variable, but so is the one that determines gravity on Earth.
I consider the unlocked scenarios the real RFC, it is IMHO more challenging, but less historically plausible.
Úmarth;9639871 said:Are you confusing locked vs. unlocked with 3000BC vs. 600AD, onedreamer? 'cos I'm pretty sure the locked and unlocked scenarios are exactly the same apart from the player can choose to play late-spawning civs from the beginning.