The Grand Carnival, Sportage and Sorento all have a very similar design language and probably a lot of common parts in the interior.
Maybe they avoided bringing an all new Sorento because it make their best seller - the
Sportage look outdated.
Maybe down the years, they will update their whole lineup with new shapes and interiors and keep the design language similar across their lineup.
The NEW CARNIVAL is a CBU, low volume seller but a FLAGSHIP model in Pakistan and probably a preview for things to come in the future (in terms of equipment, finish, quality and design). So good marketing strategy on that front!
Cheers.