Maybe, or it could be variations in the weight of the body wood. I have two identical basses (Peavey Dyna 5s) and while they both neck dive one is way worse than the other. The body on that one is noticeably lighter than the other, even though they are made of the same type of wood.
It also could be different levels of tolerance for neck dive. Some people with a strap that grips don't notice that the neck dives. My back will always notice, even if the strap keeps it from actually diving. The balance is off and my back can tell after a while. But others could play that same bass and say it doesn't dive.
In other words, there are a lot of variables, and it is best to try the specific bass yourself, and if possible try it on your own strap.
You in Hawaii? Mililani here.