Some producers such as Robert Glasper like to play both piano and Rhodes and sometimes overlap. You will hear this both live on stage and on many track of his albums. On stage due to the sound acoustics this is never normally a problem and they rather compliment each other. However when recording in the studio, things can get complicated with sound clashing etc. due to both instruments occupying the same range in the frequency.
Due to this many people will avoid adding both the electric piano and the analogue piano on the same track, however there are ways of getting around it.
1. Try to avoid playing chords on both instruments at the same time.
2. Keep the electric Rhodes as the main chord sequence and use the piano for subtle melodies and send slight to either the left or right.
3. For part like the chorus, take the Rhodes out completely and play chords on the piano instead, also sticking to melodies on the piano.
Using the above you should be able to get a decent mix with both the Piano and Rhodes sound.