Yes the difference is you can take the piston pins out without a press or heat (normally anyway). You can use a retainer, like a spirolock or a round wire snap ring (whatever the piston is designed to recieve) or you can use aluminum or teflon thrust buttons on the end of the wristpin. Either way you have to keep the pin off the cylinder wall.
FWIW I prefer floating wristpins to pressed.
