Has anyone been trying to buy Shimano parts lately???? It's been on back order for months at many sites. I even heard that there are issues with chain swaps since there are really not significant markings. Can anyone tell me the ways to differentiate the HG 73 with the HG93? And is there any truth to the rumor I heard.

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Has anyone been trying to buy Shimano parts lately???? It's been on back order for months at many sites. I even heard that there are issues with chain swaps since there are really not significant markings. Can anyone tell me the ways to differentiate the HG 73 with the HG93? And is there any truth to the rumor I heard. the 73 and 93 are interchangable. Or, just use a Sram.