Nope those are all resin kits from Yankee Modelworks. Pitroad does not make a Skipjack SSN model.
Pitroad is AKA Seawolf/Torpedo models. I have built their resin USS Halibut (three times!) and their resin USS Nautilus. Both are highly accurate. I also have their USS Grayback SSG (with Regulus II missile) and the Russian Juliett class SSG, also very nice. Some of the earlier kits, such as their Golf II SSB are not accurate, as that was issued just as the Cold War was ending, and the forward hull is all wrong.
One problem is that both the Nautilus and Halibut are now OOP. Bill Grune of Pacific Front Hobbies mentioned that if there was enough interest, he might be able to influence them to restart production. I personally need at least 5 Halibut kits to build for interested parties.
The Pitroad kits are resin kits although the resin is quite different from that in, for example, Yankee Modelworks kits. Also, white metal parts, so you need to use cyanoacrylate glue.
Here's my USS Halibut builds for the 2002 crew reunion from the Seawolf/Torpedo kits: