Excellent spec overview. They both have the Zen-Core engine so are capable of sounding identical. I'm glad someone did a comparison of the physical specs and the sound engines they come with stock. I'm actually surprised Roland put out two keyboards at such different price points with, short of the physical control layout, the same capabilities.
I have the Juno X!!! Perfect digital synth for my style of music. I added the sh-101, Jupiter 8, and JX-8P. It’s incredible!! I have not even scratched the surface of its ability. I also use it to control my Prophet-5, Akai Force, and Neutron. 💯🎶🎹