Assume you have the lower pressure sensor, and place that DUT under max
pressure and measure output. That full scale V should indicate which part it
is.
This whole thing is risky if you are doing any life support work, definitely get
marked parts.
Chinese knock off parts always tempting, but have a "real" price that may be
unacceptable, like not telling you which part you have. Some parts are the
correct part, but do not meet advertised specs.
Regards, Dana.