Machine sync is combine/grain cart where the cart is controlled by the combine. 

You're wanting in-field data sharing. It's nice but not going to help in your case much. Both machines still need to be calibrated individually. As long as the grower/farm/field names are the same it'll end up merged in OC anyway. If it doesn't, you can always merge fields later and get it as one map. You can also post-calibrate by machine in a field so if they aren't perfectly matching you can adjust. 

In Field data sharing is more for planting/spraying where you want section control to turn things off where the other machine has been. You pick the head up and stop recording on combine so it's not a huge deal