Whats the difference DA or DF in a part number for exhast gasket

[Yamahasrx700]

Whats the difference DA or DF in a part number for exhast gasket on an 01 SRX 700

 

[EVOVII_SWE]

I can't find DA in any year of SRX, 8DF-14613-00-00 is the correct part number.

 

[Yamahasrx700]

I was looking at aftermarket gaskets and one of the SRX listing had a DA listing for my sled