If it's a bearing kit specifically made for the revo, odds are, it will only have bearings to replace all stock sized bearings. Which means, you need to order some backups for your RPM carriers.
The RPM bearings are larger than the older revo bearings. Pretty sure the RPM lifetime warranty doesn't include the bearings either.
That said, I got a late model e-revo and it has larger bearings in the stock carriers. I still used the RPM bearings when I put RPM on it all around...