From experience..as I own a EX-3, you can not use a card to match these cameras...as in EX-1R or 1 to EX-3. You have to sit there and manually input the settings for the two to match. I would go with the EX-1 as the set up card that has the picture profile on it, should read the same for both cameras. I don't know why Sony won't let the EX-3 and EX-1 or 1R "talk" to each other....HTH
I would try to move the profile you like from camera to camera.
If it doesn't work It must have something to do with firmware versions as these cameras have exactly the same sensors and matrix setting.
You may just find white balancing from the same spot on the set to get them close.
Thanks very much. Your answers were great. In the actual event, I was able to get three EX1R's, and there was so much to do at the last minute that I just set the white balance to tungsten, and manually copied the Picture Profile from camera to camera; it looked fine.