Conversation Between odpurple and yogii

Hi,
I own 2 TOP Photon that I run at a local hobby town track every other week. I run both in blinky mode. I have purchased a diff that was made for the Photon EX I was hope in it would work in my older car, that I'm content with and do not wish to up grade. Can they work and if so what do I have to do to make it work.
Thank you.