It can be done without bleeding, pumping, or pressure differential although I don't know how the new propane valves on the 20 lb tanks will work. I guess you'll have to perform a test to see if liquid will pass through the valve when upside down.
Assuming you have a nurse tank like a 100 pounder, elevate the tank above the 720 tank. Turn the 100 lb tank upside down, attach a hose with the right fittings to both tanks (vapor valve on 720), and let it gurgle in via gravity. It will take a while, maybe over night. You won't lose any vapor or fuel. The 720 tank won't overfill as the vapor valve should be below the highest point in the tank. Don't use the safety device port at the top of the tank. Also don't create a "P" or "S" trap with a hose longer than necessary.
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