Changing seats between VAG cars? Help needed.

Hi all, I have a 2012 VW jetta and I have been thinking of changing out the front seats for a pair of mk6 gti seats or for a set of mk3 Skoda Octavia rs seats / Audi a3 s line seats does anyone know if the seats will be a direct fit with the same wiring etc since the three cars are loosely on the same platform or will the wiring and rails be different? Any help would be appreciated.