Denim Dilemma

The pair of jeans on the left is a pair of Paige skinny leg jeans I got around 9 months ago and wear quite regularly.

The pair on the right is a pair my Mom bought me this past Christmas.  

When I unwrapped said new pair, I got a feeling of 'deja vu', if you will.  They looked very familiar, reminiscent of my other pair when they were 'born' if you will.

I looked at the inside of the tag.  The numbers matched up.

I made the suggestion to my mom.  She said, while I was at the house, in the shower, she checked the current pair against the pair she bought and she felt they were two different pair of jeans.

Dear jury - is this the same pair of jeans?  Could I have POSSIBLY worn out my jeans so much that they look this drastically different?  Should I keep the second pair, cause, regardless of anything, they clearly look different (and I love a sharp dark denim)?  Is there any way to tell if two pair of jeans are the exact same cut and color?  Is it all in the number on the tag?  Has anyone else ever bought the exact same pair of jeans twice and worn them?

Your thoughts?