Does anyone know if all front seat base frames are the same?

[Aquavalver]

So while my VXR Recaro seats are at the trimmers for some upgrades, I refitted my 3-door optional extra heated black alcantara seats, but found that the passenger one doesn't slide backwards & forwards on the rails as it should and there's also a problem with the backrest tilt. After taking it out it was found a small area by the seat hinge was bent, so I need to get another base frame. I have found some spare used 3-door seats for GT's and R-Lines which are the same, does anyone know if the base frames in GTI and other lower spec models have the same base frames or are some different? As if so I can get a base model front seat a lot cheaper than GT or R-Line one

[Aquavalver]

Does anyone know how to find out if they are the same or different?

[iichel]

all 6r/6c frames are identical. only difference is height adjustment and 3/5 door.