My advice, do not send anything about your GRE score. Why even bring up the opportunity to have to explain something about your application. If it was an 800, then maybe, but a 760 quant on GRE is nothing too impressive by GMAT quant standards. I would recommend that you only submit your GMAT, and would only submit the GRE if you do poorly on GMAT quant.
If you start getting into this huge explanation about previous goals, then the Adcoms might begin second guessing your dedication in pursuit of an MBA. They might also question if you know which direction you want to go. If you want to get your MBA, and have the best story of an Adcom, you want to show them where you've been, where you are going, and exactly how the MBA is going to get you there.