There are two versions of the Treet Dura Sharp, one which comes in a blue wrappper, the other in a yellow one.
I've read somewhere both are supposed to be the same blade but I was using two of the blades and noticed they both had different markings.
Aside from the font, the blue TDS has each side of the blade marked with A and B, whilst the yellow TDS has numbers.
I couldn't say exactly whether the grind of the blades edges are different for sure down to consistency of the blades but I felt there was a minor difference with both blades, with the blue being slightly sharper and less smooth than the yellow, which I prefer.