Do all trains have the same coach layout?

No, all trains do not have the same coach layout. The layout depends on the train type, the class of travel, and the coach manufacturer. LHB coaches which are now standard on most express and premium trains have a different layout compared to older ICF coaches. LHB coaches are longer, lighter, and have wider berths with more legroom. Vande Bharat trains have a completely different layout with rotating seats, automatic doors, and a modern interior. Garib Rath trains have three-tier AC coaches but without a pantry car. Even within the same train, different coaches may have slight variations in layout.