Try the finder on both cameras to see if there is a difference and how much it is. Then check with a hand held meter. If all three agree you are set. When testing with a gray card be sure it fills the entire frame. If the brighter screen matches the hand held meter and the other is off enough to make a difference you have your answer but if it matches the less bright and you have been using the hand held meter for the other camera to begin with, stick with the split image if you intend to meter with the PME on the newly purchased one.