Pixel Art Scaling question

Hey,

Sorry if this is a bit of a “newbish” kinda of question… but anyways here it goes:

Ive created a square cube, what I want to do is create another to add to it. Instead of creating a new one, why not duplicate and scale it. I did so but the angled lines get distorted when I goto to scale it. Im using Photoshop - is the any way to avoid this?

Thanks!!