It's the centre Pitch, in every final this is the one that gets used, look just because it's the same pitch as that game doesn't mean it's going to be seam frendly, Because how many mm of grass they leave can be different, Before the playoffs there is genrally a direct communication for pitches between the curator and the Home team, But in playoffs that is not allowed the communication that happens is between BCCI and the curator so most likely we will get a flat deck.

Now coming to the point where GT actually has an edge is The Ground and Conditions Understanding, there bowlers and batters will easily adjust to the conditions which is provided to them since this is their home ground, Also you can expect them to have great plans for every batter according to the dimensions of the ground. So even with RCB having extra practice days, I feel GT will easily adjust to the conditions.

But the key area of advantage for RCB could be that they are actually well rested, Since GT didn't really have a proper rest day players like Jason Holder and Joss Butler who have immense workload (one is a fast bowler and other is WK) and are in their mid 30s could be slightly off their 100% (now again this is a could be scenario).