Yeah, if it will hold a hard vacuum, it will probably hold pressure too.
IMHO, it's good to pressure test, even if you have great vacuum,
since a 'flare' surface will pull down tighter with vac inside.
While pressure will try to lift the flare open.
Pressure will show the finger-tight connector.
The only problem I can see with nitrogen pressure testing is over-doing it.
Bursting something or
forcing nitrogen into the system via the service a valve.
My older system has a little leakiness in one of the valves. After it had set
for a while with a new charge, there was pressure under the valve access cap.
A little puff of gas came out when I removed the cap (to turn the valve).
To me, that was a sign to use lower pressure on the nitrogen test.
And, to insure those caps were replaced tightly.