Yes, your 24-70 will be a completely different lens
I'm an exposure, signal to noise freak, so I have to say that if you're shooting RAW and don't need out of the camera JPEGs, I would set up both cameras as follows, especially the 7D which is prone to noise.
This is to get a close to an unbiased histogram as possible so that you can be sure your capturing the max data by being able to see if you're clipping any of the channels while exposing to the right within reason.
Picture Style Neutral with -4 contrast, 0 everything else.
Use non intermediate ISOs only
custom white balance if you can, else I use 5K.
I'm sure these comments will stir up a hornets nest