I purchased the one on the left from Petsmart, it was in a tank and I believe it's Rotala Indica. It has two leaves per segment and a skinny stem.
The one on the right was shipped with some shrimp, and I figured I'd toss it in the tank and see if it will grow (don't want to waste plants) It has 3 leaves per segment and the leaves/stem are thicker.
Also any other information on them regarding care would be appreciated. Thanks!