I was also interested in this comparison, and think it might be a little more complex with the release of the AM1000 V6. It seems like the added features of the V6 to consider are:
1. Larger Built-in battery 1008WH;
2. 29/27.5" wheelset
It seems like you still get more battery (672WH * 2 / 1,344WH total) with the EX, and the optionality of using just one or both batteries. But the overall difference is less. I'm not exactly sure how to evaluate the differences in the frame geometry, but I sort of like the idea of the 29er in the front.