No, not even at a glance. I'm actually quite interested in small tablets, particularly the Nexus and iPad Mini lines, so I've done a fair bit of research on them. For one, don't let the dual core vs. quad cores fool you. The processors are entirely different in architecture. I'm well aware that the Mini 3 is internally the same as the Mini 2, but the Mini 2/3 processor is more powerful than either Nexus 7, especially the 2012 which is blown out of the water by the 2013. Look up the benchmarks of these processors. In terms of processing power, it goes like this:
Mini 2/3 > N7 (2013) > Mini 1 > N7 (2012)
And this has little to do with RAM. So it would in fact be a much more fair to compare the N7 (2012) to the original iPad Mini.