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Di2 shifter upgrade

Hi all; I was wondering if it was possible to upgrade the 6870 Di2 shifters (hydraulic brakes) for the newer version (I think 8070?)?

I'm interested in being able to control my garmin with the shifters so I would like a version with the additional button. Is it as simple as switching just the shifters, or would there be other pieces that I would need? 

Thanks in advance. 

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