Identifying reference design GTX 980s

I bought a couple GTX 980s from amazon a few weeks ago and they are clearly the reference design cards. This week I ordered what I thought were the same thing and when I got them there are some differences. For example they don't have the glowing GeForce on the side. However, they do look fairly similar overall. Trying to decide if I should send them back. Anyone know if the cards I got are just cosmetically different or if they are not reference at all? Thanks!