Please spare few moments to read the finance supplement 2, 2019. It will help you to clear a-lot of ambiguity you have.
The 10% excise duty is being implemented on cars with 1800cc or greater than 1800cc engine capacity. No Toyota Corolla, Honda City, Civic, BRV, and Suzuki cars being manufactured/assembled in Pakistan falls in that category.
Finance Bill Supplement 2019