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Always double check that they are still active before killing them. I’ve found several on my tomatos before that have been essentially paralyzed. If you let them be, you’ll see some cocoons of these parasitic wasps show up on their back. They will then go seek and destroy any others in your garden.
I don’t know. I suspect that since it is a specific predator that has co-evolved with tomato hornworms, they would completely overlap ranges. Looking at the map of observations people have put on iNaturalist, though, it does not look like they are in your area, so who knows.