As you hab such a short question, I will give you a short/simple answere as well. They are both the same, the CX860 only has the bigger Iveco engine with a few more horsepower.
That results a higher price of about 12.000$ -I can't tell you this for sure, it's only what I hered a while ago. Because of the different engine you also have different oil- and airfilters, but those are details that I think are not too important.
In Europe they offer the 860 with an optional hopper, that holds apr. 40bu more grain, in the US/Canada they have all the same hopper I think.