RCM 1/8 motor mounts > compatibility between models?

Hello,
I post this thread because I need to know wich motor mount could be used on which car?

I know we can use an MBX5 motor mount on an EB4 without modifications, but is it the case for any other motor mount?

For example can we use an MP7 motor mount on a MP9 without mods?

And for the Xray one, what are the suitable models? XB8 EC? XB8R? 808?

Thanks for your help :).

Christophe