The URSA has already proven to have a better image than the BMPC due to the liquid-cooled sensor that decreases noise in the image. Not sure how this will work in the CION.
The sensors may be the same, but the processing of that raw sensor info is all up to the camera manufacturer. Blackmagic has their own color science and "look" that they've worked out. It's not as realistic as, say, Canon's, but it has its own aesthetic appeal. AJA will develop their own color and look which will be unique from Blackmagic's look.
...Though I'm curious if the raw sensor data could be interchanged between the two systems since they are coming from the same sensor...Probably not, but as a non-engineer, I'm curious.