Thanks for the reply Lauren111, actually optimize the main domain for mobile, but i dont like how it look the website in mobile.
The idea is to use diferent worpress instalations and diferent themes, but the only thing is the subdomain version is only the Home Page.
In this case if i use the same information of my domain home page for the subdomain home page, can hurts my seo?
If i use diferent info helps to seo?