I think there are two different 61 inch buckets, regular and heavy duty. The heavy duty one is heavier, but I'm not sure by how much. As mentioned, the HD one has the removable cutting edge.
I'm pretty sure that the JD literature doesn't recommend the HD bucket for the 200CX loader. Probably woudn't hurt anything, other than reducing your lifting capacity.
At any rate, I went with the "regular" 61 inch bucket and have never regretted it. It has been especially great for spreading gravel and mulch.