I don't think the technical details of the battery capacity/range are correct. The standard Nissan Leaf has a 40KWH battery with a range of 150 miles. The longer range model has a 60KWH battery with a range of about 240 miles under ideal conditions..
The difference is probably the vehicle weight.
For example our BEV Hyundai Ioniq 5 has virtually the same EV tech as the Kia EV6. But the EV6 gets better miles/kWh than the Ioniq simply because the Kia is a small sedan shape, while the Ioniq is a crossover/mini SUV shape.
Add to that the possibility that the pickup might have a more powerful motor to carry a load, even if small relative to other pickups, and it might not be expected to have the same range or miles/kWh as a car. Much like a gas pickup doesn't get the same mph as a car.