What are all the differences between the 15-Inch “Mid-2015” Retina Display MacBook Pro models? What are the differences between these models and the “Mid-2014” models replaced?

What are all the differences between the 15-Inch “Mid-2015” Retina Display MacBook Pro models? What are the differences between these models and the “Mid-2014” models replaced? The 15-Inch MacBook Pro Model (Photo Credit: https://www.zdnet.com) Apple discontinued the production of the “15-Inch Mid 2015 Retina Display MacBook” models that featured dual graphics; however, it still has the Retina Display versions of the same line, only with fresh integrated graphics. That’s already a remarkable difference among 15-In Retina Display MacBooks, and there are still more.   By default, there are two Retina Display MacBook Pro models you’ll come across in the market…