Even though there's already a similar question [here](https://ell.stackexchange.com/q/186497/110852), mine is a bit different. I want to know if they **can** be used *interchangeably*.

This question came to my mind, actually when I was playing Duolingo. I did the Spanish course, and the original Spanish sentence was:

> 
> Mi vida no es mejor que la tuya.
> 
> 
> 

[![enter image description here](https://i.stack.imgur.com/Ohc3H.jpg)](https://i.stack.imgur.com/Ohc3H.jpg)

I used Google Translate and the translation is:

> 
> My life is no better than yours.
> 
> 
> 

[![enter image description here](https://i.stack.imgur.com/9B5ns.jpg)](https://i.stack.imgur.com/9B5ns.jpg)

The key answer (from Duolingo) is

> 
> My life isn't better than yours.
> 
> 
> 

[![enter image description here](https://i.stack.imgur.com/dagiZ.jpg)](https://i.stack.imgur.com/dagiZ.jpg)

However, my answer was accepted by Duo. Does that mean both can be used interchangeably?

P.S. Please, note that sometimes, Duolingo gives the translations based on the literal meaning from the original language rather than idiomatic English. (That's why I doubt it)