Deploy a MEAN stack application to an existing server

I have a Ubuntu Server on DigitalOcean which hosts a website, and a Windows Server on AWS which hosts another website.

I just built a mean.js stack app on my MAC, and I plan to deploy it to production.

It seems that most of the existing threads discuss about using a new dedicated server. For example, this thread is about deploying on a new AWS EC2 instance; this video is about deploying on a new Windows Azure server; this is to create a new droplet in DigitalOcean.

My question is, is it possible to use an existing server (which hosts other websites), rather than creating a new server? If yes, will there be any difference in terms of performance?

via SoftTimur