I'm not sure the two cameras are supposed to produce identical images. But the image you see in Lightroom is just an algorithm by the Adobe engineers on how to display the RAW data, there is no right way and no unique way to display the RAW images; and there's also nothing that says the two images should be identical.
PaigeM is correct. This is just the Adobe default, or starting position. You can tweak from there or perhaps create your own camera specific import preset to give you a more pleasing starting point.
Thanks for the replies, guys.
While I agree that there is no right way to display the RAW images, each camera has a color profile (a color matrix?) that is used by LR to render colors.
There are cases when a RAW converter like LR can in fact interpret the color profile incorrectly.
For example, there was a bug in LR 2.5 where 'green' values in the RAW file were interpreted incorrectly (the so called 'unequal green response' issue).
You can read about it here:Important Note Regarding Lightroom 2.5 and Camera Raw 5.5 for those using PowerPC
The difference in orange color saturation between the 70D and 80D is very noticeable.
So, I wanted to confirm that this is not some color profile issue with LR6.5 and 80D.
You might want to search for bug reports on this matter at http://feedback.photoshop.com/photoshop_family
Although without additional information, it's just as likely that Lightroom algorithms are doing what they are supposed to do, and that perhaps the cameras or sensors are the cause of the problem.