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Pressure is pressure, but the main difference is, liquid does not compress. put water in an engine and BANG, dead engine. Because gas can compress, it has more force behind it when released, and this is why 65 PSI of water pressure isn't clearing the lines. 65 PSI of compressed air though will have a better chance of doing it.
Lets say you have a cylinder of compressed liquid. Puncture it and a steady stream of liquid will come out. Now take the same cylinder and pressurize it with a mixture of liquid and air. Because air is compressible, there is a much higher volume of air to liquid. Now puncture the cylinder and watch it go flying.
So, yes PSI is PSI, but the medium under pressure makes a difference, in this case, the air works great. Though, 200 PSI, that makes me cringe. I have seen copper give out at 90 PSI, and Black pipe at 120. I used to maintain a factory in Chicago, and one of the jobs was maintaining the air compressors. One setup was 225 PSI for the punch presses, some scary stuff to be around.
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