I need someone to bring me back down to earth regarding matching car seats

I have a tan & black Britax car seat when my two year old used it. They discontinued the color so I decided on black for the twins. Since we plan on using the snap n' go stroller until they grow out of their seats, should I just use the old tan car seat and just buy one new seat? Or should I buy a two new black seats so they can match? It would save me $230 if I use my old one but I HATE not having matching seats. I also do realize how stupid my problem is and need someone to tell