Yes, they are the same. However, you should specify time. Did he start earning six times as much (or six times more) nine years ago? Probably not. I assume you mean now, so:
1. He NOW earns six times more money every year than he did ten years ago.
It does not specify when, but it implies that his income has been rising, and NOW it's six times more than ten years ago.
2. He NOW earns six times as much money every year as he did ten years ago.
Hope this helps. :-)