Does displaying "grid" on the mobile theme help s.e.o.?

Hi,
Displaying the latest posts on mobile, will indeed help s.e.o. because, the latest posts are display on desktop too.
Now about the number of posts, I don’t think that there will be some difference. But for a better s.e.o you need to use the responsive version (disable the mobile theme plugin), in this way everything that it is on desktop will be on mobile (the content will be the same), this will help to have a better s.e.o but, with a low performance on mobile. Using the mobile theme plugin the s.e.o on pages can be a little low, but the speed will be better.
Thank you for your understanding!