It's fine, I suppose I simply misunderstood you.
The 767-400ER is still a 767, no doubt, but the cockpit layout is quite similar to the 777. CO pilots change between the variants quite often, I myself fly the 757 as much as the 767, maybe even a bit more as the 757 trips and scheduling sometimes work more favorably for me . We underwent training to convert to the 764 prior to its delivery, but the program was short and only a bit more extensive than the differences training that one would receive when transferring from 757-200/300 to 767-200/300. An interesting feature of the 764 cockpit is that, while the displays are arranged nearly identical to the 777, the information that you can show on them can be programmed to present information like the earlier 767s and 757s, or in the same format as the 777.