I believe YES! Customs duty will be same.
Not recommended! I would strongly oppose any of the cars which you have mentioned.
Brother if in Pakistan, only import those models, which are considered as "Market Ki Cars", and have their counterparts in Japan, e.g. Yaris in UK, Vitz in Japan, and so ON...
Do not import Hyunadai Kona and Kia Niro Hybrid, almost zero support here regarding parts, mechanics and other stuff.
I am sceptical about Vitara 1000 cc, but I fear, it will meet similar fate like Kona and Niro.