Did these arise from some common source predating both (PIE?), or was the Graeco-Roman week imported into India at some later point in time?
One look at that chart you link to makes clear that the author is deficient in understanding Norse mythology:
That's three of the seven days with a serious issue on the claimed equivalence. The Sun and Moon are often seen as celestial book-ends, so putting them at the start and end of the week may simply be an extension of that. I don't see any need to invoke more human rationalization for the other claimed equivalences.