Is it duplicate or not ?

Duplicate is not about the URL itself. (In that case the slug about-us would be dangerous to use.)

It’s about the content.
If you in these two pages have exactly the same content, then it will be regarded as duplicate content.

The more typical way of getting problems with duplicate content is when the same content can be reached over various URL’s.

@allgames

No that should not count as duplicate content.

This is how it might be seen depending on your permalink structure

However, if you have a single post in multiple categories, that could cause a problem.

I found the first answer in this article to be helpful: https://www.quora.com/Is-that-bad-for-SEO-if-I-post-my-one-article-in-more-than-one-categories-of-my-blog