Different Idol 5 models

[Android Central Question]

I recently bought a Alcatel Idol 5 love the song had a fingerprint sensor on the back but if some an authorized Cricket dealer however when I had a warranty issue and sent my phone and they sent me one back without a fingerprint sensor saying it's a cricket exclusive now I'm having trouble finding the model number for the phone I did have and I'm wondering other than the fingerprint sensor what the differences are and which one's better