I have a website that is right now setup using T4 and JA Stark. I want to compare the build of the site content using Uber, but that uses T3. Can I install both T3 and T4 to the same site? If a module uses T4 can it be used with the Template style that is using T3 if T3 is installed and vice versa, can a T3 module be used with a Template that uses T4 if T3 is installed? Do all modules have to match the framework being used by the Template. JA ACM works with both T3 and T4 it seems, are the modules actually different?