You mean it's not A-B-A-B-A-B or B-A-B-A-B-A but it could also be A-B-B-A-A-B ?
Anyway, my bad ears can't tell a difference really.
But even with good ears it would be hard to pin point wich is wich because Viper has that "virus" sound, punchy, clicky, smooth sound wich is not easy to replicate and for certain patches almost impossible
But Virus in general especialy when lfo with max rate applied to pitch can sound a little muddy and less clear comparing to real thing. Also that applies to the detune. But in the end it still the closest you can get
I just hope Adam wount just make a 64 bit version but also gonna add some features that virus has like Hypersaw sync and ability to use wavetable shapes in lfos
But in first synth comparison A is Virus and B is Viper in second first is Viper and 2nd is Virus