The thicker one is probably a viscus fluid type while the original on the tractor was a rubber cushion style.
I would use the new one from CIH.
There were things upgraded from the first production models. the woodruff key was made longer with steps to keep the key from sliding out of place while installing the pulley. If it comes out of place it will crack the new damper pulley. There was a thin sealing washer added between the pulley and the oil pump to keep oil from leaking between the crankshaft and pulley. There was a plate added to the front to keep dirt from being blown back into the seal by the fan.
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Today's Featured Article - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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