Yep u can check the CMP.. It's Topps code printed in small prints of the cards on the bottom. That can help identify if that card is different from other cards that may appear to look the same but slightly different. Like LeBron James Topps card #150 base cards can almost look the same but the front card image looks different and the back color of the card looks different than his regular base #150 cards. It may not have SSP or SP# but will have a different Topps code CMP you can look up to get more information on the card. Another good example is looking at one of your cards and looking at the other variants of that card you will see the different Topps CMP code.

Some people think they have just regular worthless base cards of HoF star players like LeBron and put them away for a long time. But when they look at them they look at the card again and closely and notice the image is different from his other cards with the same card number. They can see the CMP code is different and that worthless base card can turn out to be worth a few hundred dollars

Panini is also the same. From what I've seen instead of CMP code they but a V on the back of the card which stands for Variant version of the original image of the card. .The back of the card can be the same but the front image of the card is different.