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The CA-71 would have features like 192 note polyphony, extra pre-recorded classical music pieces as well as some other fancy software running inside known as "Virtual Technician" aswell as lessons and finger exercises for personal practice.
The CA-7, the older version, has only 96 polyphony and has only four speakers whereas the CA-71 has six built in speakers.
Apart from that, they both have the same type of sound processor/sampling and have the same type of wooden-keyed, graded hammer action keyboard.
Fairly subtle differences in terms of practical use, but upgrades nontheless in the CA-71.