Recording video's with two cameras?
I've had my fair share of matching. C100 with 5D MK III, 5D MK III with 7D, 7D with C100, 7D with a Sony Camcorder.

It's all a matter of getting two cameras that are similar in terms of resolution and how 'soft' the image is. For example, the C100 is incredibly sharp, like 4k sharp in 1080p, whereas the DSLRS I mentioned are quite soft. Although you can add sharpening, it doesn't have the same feel and really gives you the idea that two cameras were used.

That being said, staying with a DSLR within the same camera company means that the baked in color profile should be relatively consistent. The sharpness on the other hand my not be, but with DSLR's you'll never get really sharp images (excluding the GH4 and A7S) so I would say go for it.

You might see some subtle difference in color tone. Some casting more or less of a certain color in the exact same environment which is an easy fix with some general color correction. I'm willing to bet if you make a color correction present using footage shot in a consistent test environment you can make your workflow much faster. Its just a matter of watching your scopes for consistency. It helps if you use a similar lens, focal length, subject (go with a person you want to match skintones), and lighting setup (tungsten) for these tests.

Some color correction info another one of my answers: https://video.stackexchange.com/a/15998/10619