Comparable on paper perhaps, but Nvidia architectures tend to get more actual gaming performance per FLOP than AMD architectures do.
i.e. the AMD RX480 (5.8 TFLOPS) is 30% faster than the NV GTX1060 (4.4 TFLOPS) on paper, but in practice they perform more or less the same.
Even in titles where AMD performs especially well the advantage is around 10-15% in favor of the RX480 - still less than the specs would suggest.
