Is there difference between a Shimano HG200, 11-36, 9 speed VS HG201, 11-36, 9 speed? Is there difference between a Shimano HG200, 11-36, 9 speed cassette and a HG201 11-36, 9 speed cassette?
CS-HG200 is black, CS-HG201 is silver.  Otherwise they are the same.