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Depends on what you mean exactly by 'can communicate with'.

Code written for Electric can always be made to compile on Fuerte, provided that you take care of the necessary changes. Depending on the actual code that might not even be very difficult. I've had multiple packages I could just rosmake --pre-clean in a Fuerte shell and they 'just worked'.

If you want to mix binary (as in: already compiled) nodes from Eletric with new ones written for Fuerte, that is not going to work, or at least really not recommended. Message formats could be different between the two, as well as ROS internals, which can (and will) result in either an incorrectly functioning system, or (subtle) bugs. It can be done though, but it depends on actual messages used, use of ROS libraries, etc, etc.