The VF-19 and VF-22 (as well as the YF-19 and YF-22) are based on the USAF's Advanced Tactical Fighter (ATF) program YF-22 and Northrop YF-23. The YF-19 was also partially based off the Sukhoi Su-47.
The VF-25 has more in common with a Variable geometry fighter than an F-18/F-16...I would say it has DVI, Combat AI, AESA Radar and other 5th and greater generation type avionics.
VF-17/171's are based of the F-117 Nighthawk...