Whether it plans to make changes to these powertrains, introduce a new one or replace an existing one remains to be seen. (indianautosblog.com)
The only mechanical change to the powertrain is the fitment of a more free flowing exhaust system. (evo.co.uk)
Extrapolating this and also your earlier response about motorcycles; if you look at Motorcycle engines of comparable size / cylinders to small car engines of similar capacity, you will see that the car manufacturers often still decide to adopt major design changes to their powertrain - rather than just using the same engine design approach. (mechanics.stackexchange.com)