Technically, I would be comfortable with using 90% of the one from PST too, but I don't think it is legal for other brands. The REEs for industrial tanks in CGA-5 are based on worst case from all of the manufacturers, not just one. Unfortunately, they don't list a "generic" SCUBA 72.
When it comes to regulations, "Safe" and "Legal" don't mean the same thing.
When it comes to regulations, "Safe" and "Legal" don't mean the same thing.
Though since as I understand it they were all made to the same specification, I would be comfortable using the one steel 72 REE we do have, from PST, for any 72, especially if a tank passed with a reasonable margin.
If you look at the list of REEs for industrial tanks in CGA-5 you will notice that they just list various size and pressures of cylinders and give the REEs, with little differentiating for the various manufacturers or years of manufacture.