I'm not sure what you mean with camber-wise maxed out suspension. Normally the camber cannot be adjusted, so there is nothing to max out. However, if you use adjustable TCAs on the Sierra I don't know if Granada arms are longer than maxed out adjustable Sierra ones.
BTW, I measured the arms not so long ago and I think the difference between Sierra and Granada front TCAs is 12 mm. I expect this 12 mm should give you about 1.15 degrees more camber, for the same ride height. To keep enough thread from the tie rod in the tie rod end I would also use the Granada tie rod ends as they are also longer, just like the TCAs.
For the rear the Granada arms also give about 12 mm wider track. I suppose to accomodate this the Granada driveshafts are a bit longer, but I never put them next to Sierra driveshafts. The beam and arb can be used independently from the arms and driveshafts.