After uninstalling and reinstalling everything VNAV continues to have changed from the previous 757 action. On the reinstalls there were no windows indicating gauge acceptance, so perhaps it is in the gauges that the fmc changes were made so that both the 757 and 767 essentially use the same fmc. Just my guess.
The big change is that VNAV will begin controlling speed and altitude and at some point, perhaps T/D or other point, the VNAV switches off and SPD controls. Now the pilot must dial in any speed change which is then controlled. Speed and Altitude are not controlled simultaneously as with the early 4.3 version of the 757. Instead, once the speed is achieved, a new altitude may be dialed in, and controlled by pressing the V/S button and quickly pressing the VNAV button. One must alternate between dialing in speed and altitude changes manually. Perhaps this is more like normal procedure. Don't know, again just guessing.
Downloaded both the 767 and 727 at midnight and installed this morn. Glad for the cost saving for two very nice aircraft. Liking them a great deal now.