LP-Regulator Swap Question

I have two Ensign Model "R" LP regulators. The regulators look exactly the same. One is stamped 250 psi working pressure and the other is
stamped 375 psi working pressure. Is the stamped working pressure on the regulators the maximum? What is the difference between the two? I
would like to swap the 250 psi working pressure regulator with the 375 working pressure regulator. Is it possible to make the swap? This is
for a 1957 LP MM GB.

Thanks.
 
The regulators may be interchanged. The maximum working pressure is stamped. Many tanks have a 250 psi relief valve.
 

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