Everyone here so far is comparing different models, but you can just compare the exact same car to remove (most) other factors.

2020 Kia Niro LX (1.6L petrol engine): 3,100lb

2020 Kia Niro Touring (1.6L petrol engine): ~3,250lb

2020 Kia Niro EX (64kWh EV): 3,854 lbs

Batteries are heavy.