Honestly, I was always under the impression that "Mongol" and "Mongolic" were interchangeable terms in light of the fact that the modern-day Mongols are an extremely homogeneous group, a la the Arabs and Turkic peoples. The differences between "German" and "Germanic", for example, are far greater than the differences between "Turk" and "Turkic". Likewise, when it comes to the Mongols, the terms "Mongol" and "Mongolic" aren't really meant to have different meanings since the Mongols are extremely homogeneous.