Django is a backend framework written in python.
Strapi is a backend framework written in Javascript.
Both are Backend frameworks, though the big difference here is that Django has more batteries included.
In django you can render views and pass data to the “frontend” if you like to call it.
If you use Django with DRF (Django Rest Framework) they are very similar indeed.
Django though it’s not a CMS it’s a framework. Strapi is more of a CMS kind of like Wordpress 
I do see the similarities but if you work with both they are way different.
Strapi takes shorter time to setup and work with, as a frontend developer, while Django can crunch more numbers etc, due to been python.