I hope this helps clear things up

Configurations:

EK maintains three cabin configuration for their crew-rest configured B77W aircraft. These aircraft are scheduled all routes with scheduled block times exceeding 12:00 hours, and therefore all North American destination served by the B77W.

8F/42J/304Y configured aircraft feature:
Previous generation F/J and previous generation Y seats.
A/C registration: A6-EBQ/R/U/W/Y and A6-ECA/C/D/E/F/G/H/I/J/K/M/O/Q/R/S/T/U/V/W/X and A6-EGA/B/C/E/F/H/I

8F/42J/306Y configured aircraft feature:
Previous generation F, Game Changer J and latest generation Y seats.
A/C registration: A6-EPV/W/X/Y/Z and A6-EQA/B/C/D/E/F/G
Note: Game Changer J seats feature grey colored leather

6F/42J/306Y configured aircraft feature:
Game Changer F, Game Changer J and latest generation Y seats.
A/C registration: A6-EQH/I/J/K/L/M/N/O/P
Note: Game Changer J seats feature champagne colored seats

Upcoming schedule changes:

As of 04NOV23 EK416/417 DXB-SYD-DXB is upgauged from the current B77W configured 8F/42J/306Y to the A388

As of 05NOV23 EK231/232 DXB-IAD-DXB is downgauged from the current A388 to the B77W configured 8F/42J/306Y

Current and future North American destinations served by the B77W:

8F/42J/306Y configured aircraft are scheduled to the following North American destinations SEA/ORD/EWR/BOS and from October DFW and November IAD.

Note: When the scheduled aircraft configuration is unavailable a 8F/42J/304Y or more rarely a 6F/42J/306Y configured aircraft will operate to the destinations listed above.

8F/42J/304Y configured aircraft are scheduled to the following North American destinations YUL/MCO/MIA, from October YUL is downgauged to B77L

Note: When the scheduled aircraft configuration is unavailable a 8F/42J/306Y or more rarely a 6F/42J/306Y configured aircraft will operate to the destinations listed above.

6F/42J/306Y configured aircraft are currently not scheduled to any North American destinations.

Clear as mud?