In a word, no. You are overlooking the difficulty in deploying an expeditionary force that needed to be trained and equipped in America, shipped over the Atlantic Ocean, docked in England, then transported by rail to South England where they would reassemble and put into ships again to cross the Channel. Imagine all this military and logistic chaos taking place at the same time the very tanks, guns and trucks to be used in the coming battle were under going designing or being qeued for production. To introduce the Pershing tank into the intricate plans would be like performing a heart transplant while the patient is undergoing neuro surgery. In fact, in May 1944, there were ten T26 prototypes in the US Army, and they were all state side, less than one month before the Allied armies start an amphibious strategic offensive. Mind you, amphibious strategic offensive was a type of operation that military strategists pronounced impossible at the 20s-30s because of the failure of Gallipoli. This was to be practiced on the Germans, who had the best army in the world, at the part of Europe that was the best defended real estate in the world. To get any servicable tanks on the beachhead, rapidly and in overwhelming numbers, were of far greater import than what tank they actually would be.