WordPress – Multiple Sub Domains – Single Content(database) – Single Theme / Plugins

I am looking to develop a website with different branding or sub branding.

ie:

Each of the websites will use a singular theme and content. The only difference would be on various pages have different headers / footers. I would like the pages to have slightly different sections. Some subdomains would even have different color branding.

ie:

There will only be a handful of subdomains so it would be manageable to create a multisite network and just copy pages / posts from the primary site.

I understand there may not be an ideal solution, but I am interested in the best possible solutions.

Again, ie: