Yes I suppose they are one of the vintage mods.
I don't know how they compare to the standard squier pick ups as that was the only Squier Jazz I have owned.
My feeling was that they were good, certainly not thin/weedy sounding as can be the case. I swapped them out not because there was anything wrong with them but rather because I wanted to hear what a set of Wizard pups would sound like.
There are a fair few bass chatters who own the Squier VMJ and probably with the stock pups, it might be worth asking for their opinions in the relevant forum.
All the best, Gary