Wishbones are different. They have a larger bush at the rear. There is some debate as to whether the original FRS wishbones have extra bracing inside, but nobody can confirm that 100%
We have fitted standard 2.0 wishbones to my son's FRS, as the genuine FRS items are £440+ each from Ford, but the 2.0 ones are around £95.
We pushed the bushes out of the new arms and replaced them with the larger Powerflex FRS bushes . Fitted perfectly at about 1/3 of the price.
I think the rollbar is thicker too