Not usually. Hydraulic systems use fluids. Pneumatic systems use gas.
Hydraulics are powered by liquids under pressure and pnuematics are powered by gasses, usually air, under pressure. Both liquids and gasses are fluids.
air pressure and distance
Hydraulics
My thoughts go like this...(from watching 'Scrapheap Challenge"0 plus a little basic knowledge of physics. 1/ Pneumatics involve the movement of pistons and what not via the medium of compressed air or air under pressure. 2/ Hydraulics involve the movement of pistons and what not via the medium of compressed fluids or fluid under pressure. 3/ Fluid is denser than gas (compressed air). I believe hydraulics can handle far heavier loads than pneumatics. Pneumatics would appear to use a lighter more flexible medium than hydraulics. In answer to your question, I believe hydraulics would be far more effective at manipulating heavy loads versus pneumatics. However, pneumatics would be a more flexible system than hydraulics. Hows that?
"in" and "out" are the direction of the pressure.
hydraulics
Semi trucks have air brakes, no hydraulics some very old trucks had air over hydraulic systems but they used no more pressure than any other system
One similarity is that they both use fluids. Both gasses and liquids are fluids. the two are also compressible.
The answer will depend on the temperature and pressure.
In hydraulics. Power is transmitted through the air. The pneumatic. Power is transferred by the oil.
Hydraulics is the use of liquids to transmit power. Pneumatics is the use of gases (usually air) to transmit power.
oil is slightly compressible 0.5 % at 70 bar. but air is compressible. so to get the required pressure pneumatics require more energy source than hydraulics also there are some limitations for pneumatics in terms of force.