Well it is similar (in a way) and yes 9x15 is nowhere near to 90 - but my comment was based on the correct 6x15 .
So the difference is around 10° and this moves the frontier between the Hadley and Ferrel atmospheric cells (where deserts are) some 1000 km South off my coast. But that is no major problem - I ll only have to eliminate the desert which just became a temperate, humid and fertile region.