New Matchbox Viper?

[V10SpeedLuvr]

I found the car on the right about a week ago at Wal-Mart. I noticed the cars and #'s on the card are the same, but the picture on the background of the cards are different and one is listed as a Viper GTS and one as a Viper GTS-R. Is this an error or is the GTS card just a newer version of the GTS-R card?

 

[Hoosier Daddy]

The one on the right is a newer card. The left one could be considered an error but it is not rare!