Aligning several products into one single design. HELP

Hello Everyone,

I’ve been assigned to this fun project - I’m supposed to align all of our different products into one design so they all look and feel the same.

  • These products differ in many ways: some of them are b2b & b2c, others are for external or internal use only.

  • I have only few weeks to finish this project.

How do you go around this? And what approach do you choose? (there is not enough time to create wireframes for every single product, so we are looking for something like a style guide)

Thank you!