That shield is the CTE shield. You might be better off going to the ColdTears ebay store and getting the story from the horse's mouth. I have it and I understand it will do a swag of displays right up to 7". I also understand the principle difference is that the larger screens have a higher 3.3v power demand but these shields have an on-board regulator off 5v for that purpose.
The smart move is to get the shield and display from the same source and at the same time, and even then you can stumble. So you might check with the LCD supplier first, if you have already gotten it from somewhere else..