One of the things I noticed is you are using GCD APL patterns, all depending on your monitor I would not expect identical results from the 2 patterns. Also avshd709 rounds down to neatest integer, where gcd uses mathematical roundings. What software are you using?
Let me clarify as I could be misunderstood. Avshd709 is not wrong its all about how the software works. DVE and AVSHD709 has the same values, and the difference is minimal to gcd. In this instance I think the difference is down to apl vs windows.
I think chromapure uses % aswell but not 100% sure