Yes there is quite some spread in the VGS,off and other related parameters. A high high VGS,off also come with a high Idss.
This are just random / charge variations in the process. If you by multiple one from the same production run, chances are that they are quite similar, but no guarantee and you still don't know if more -0.4 V or -1.5 V.
I have not tested part in question here, but some other parts (2N4391, J202). The parts from a batch were relatively similar, but still with some variations (like 0.5 V range).