Can different logos and blog feeds be used on subdomains of a WordPress Multisite?

Hello,

I've been making WordPress sites for several years and am about to embark on my first Multisite. Before doing so, I had a couple questions. First, depending on the theme I use for the main site (I'm probably going to use Avada), will I have the ability to change logos and other similar controls at a subdomain level? Each subdomain is intended to have a different logo / branding - but all should be able to work within the same theme.

Second, each of the 5+ subdomains will have an active blog (updated daily) and these will be auto-sent to various social media channels. I know with a normal WP install you use mysite.com/feed to distribute this info. Will I have different feeds with a multisite (sub1.mysite.com/feed and sub2.mysite.com/feed) or are they all lumped together (mysite.com/feed)?

Thanks for your help,
JB