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No it's not that simple, you can use 6870 parts. You just need the right junction box and battery
from http://carltonbale.com/shimano-di2-everything-you-need-to-know/ :
Synchronized Shifting and Bluetooth Wireless Units can be added to all
E-tube Ultegra and Dura-Ace systems but the battery has to be upgraded
to the BT-DN110 Internal Battery or BM-DN100 External Battery Mount.
To add Bluetooth capability, a EW-WU101 or EW-WU111 inline transmitter
must be added to road bikes and for mountain bikes, the SC-MT800 or
SC-M9051 display/transmitter unit must be added.So @Shroom you can just about do anything, but it all depends on what parts you have and how fancy you want everything..
Jaap
Shroom
SC-M9050, SC-M9051 or SC-MT800 is required for synchronized shift, plus MTB mechs, but roadie shifters are ok, including R600 pave shifter.