@CT-Rich I have personal experience. I had a JetAir same as a Mistral just a different face. It was always used on the same pedestal type J valve. These valves have a more narrow body than most later made valves. I used the JetAir once on a 3000psi tank.
That yoke never fit that pedestal valve again, too loose. I had to use a longer thumb screw to solve the issue but that regulator and valve had been diving together for 50+ years without a problem until one dive on a 3000PSI tank.
My vote is no.
Good luck with your old new regulator. I'd go for a Cyclone 1st stage, a silicone diaphragm and the new style duckbill from VDH as well as new wagon wheel valves.