If a scorpion pierces itself, will it die or immune to its poison? If it produces the venom its blood should be immune to itself poison.
in an experiment a scorpion, Bulteus australis, was killed by an injection of the same venom as its own (reference).
So, it should be safe to say that there is a very low chance for a scorpion to be affected by its own venom. It is said that
Mutations in the scorpion’s own membrane protein genes make the arachnid immune to its own venom (reference).
A scorpion could die quickly if venom is injected into its brain (nerve ganglion). Larger species inject a higher amount of venom to overcome the smaller ones and should have specific neurotoxins if smaller scorpions are their prey to disable them (reference).