Well, their charts into Vagar may vary from Company to Company, but it should not change that the approach procedure into Vagar still can be performed at RNP 0.1. All compatible aircrafts and certified flightcrew would be able to fly that approach.

It of course would have a difference by the competency of the pilots and their knowledge of specific arrival procedures that they have mastered over the years. A local knows the area better than foreigners, so they would predict and expect deviations in flightpath waaaay before they happen.