A new screen has been integrated in GH to get a better rendering. 
GH version 2 still has a 1.3" screen, but with 240x240 pixels (ST7789 library instead of ST7735). 
But most of the photos and video presentations still have the old version.

GH is 100% compatible with both versions, just by importing and calling the right library because it uses fonction to call current screen size : 

tft.height()
tft.width()