outdoorsmen
No the 50 cal sabots are all black and there is no special coding on them. If the came from MMP they will be marked on the package - if they came from a vendor - then you will hope that they were what you wanted when you made the puchase.
Normally the yellow Barnes sabots are comparable to a HPH-12 sabot the thickest of the sabot line - designed for Knights (older Knights) and Whites.