H Series Geroter Motor, 3.60 cu in/rev, 4 Bolt Mounting Flange, 1 in. Straight Keyed Shaft, 1/2 NPT Ports, Compact yet powerful|Extended bearing life|Increased shaft seal

For a 4-bolt flange with a 1 inch straight keyed shaft, yes this matches up on both counts. The H Series runs 1/2 NPT ports as well, so as long as your existing hydraulic connections is sized the same, the swap should be pretty straightforward. Displacement comes in at 3.60 cubic inches per revolution, so confirm that lines up with what your auger drive was originally spec'd for before pulling the trigger.