They are fundamentally different types of vehicles. But putting that aside, if you want to compare the largest payload that each vehicle can transport you wouldn’t just use the pickup truck’s GVWR, you would also include it’s towing capacity. There’s a reason 90% of the time people use a pickup to haul something, they’re towing.
At this point, that’s kind of like saying Macs run a variation of BSD. It’s technically true, but not practically useful in most cases.