EXPOSURE METERING IN LIVE VIEW
The options appear to be the same, but you may discover some subtle differences in the results
The standard metering sensor does not cover the frame’s full area, but live view does, so you may see exposure variations.
Differences in coverage mean that you may see slight exposure variations between viewfinder and Live View exposures.
In Live View mode, you can move the AF point, and hence the spot metering area, right up to the edges of the frame.
With viewfinder photography you’re using the standard 3D Color Matrix sensor.
LIVE VIEW METERING
In Live View, the standard metering sensor is no longer used. Instead, the camera measures the exposure using the imaging sensor itself.