Ipad 9 graphics for Pubg Mobile not good as Ipad8

Hi Apple developers, i recently purchased ipad 9. I also have ipad 8. I am disappointed with the graphics of ipad 9 on pubg mobile as it is not as good as Ipad8. I used exactly the same graphic config in game and i can see bad pixels on object lines on my ipad9 which i dont see on my ipad8. It seems like the dpi for ipad 8 with the game is finer. I have yet to compare it with other of my games but this is a frustrating upgrade since i plan to give my ipad8 away to one of my siblings. Pls help clear this issue. Thanks