Best Way to Showcase Multiple WordPress Templates?

I am new to wordpress, and currently hosting a local website on my machine using Docker.

I am needed to display the same content (with slight alterations) on several different templates, and was wondering what the best way to do this would be. Should I just create an entirely new website for each template? Or is there an easier way to, say, save backups of the website with different templates?

Any help would be appreciated! Thanks in advance.