Male threads of that size have more than 0.002” tolerance on the OD of the threads.
Pitch diameter is difficult to measure without special tools.
Pitch diameter is a tighter tolerance and much better data point for determining correct size of male threads, or if it’ll fit a standard size tapped hole.
I wouldn’t assume the new parts are out of tolerance by measuring the OD and finding only a 0.002” discrepancy.
0.002” is half or less the thickness of a standard hair.
