He said fitted with a CRC, which I’m guessing means cockpit/crew rest compartment necessary for a trip this length in this context.
The following EK -300 ER have the aft overhead crew rest:
-EBQ/R/U/W/Y - 8F/42J/304Y - 349t MTOW
-ECA/C/D/E/F/G/H/I/J/K/M/N/O/R/S/T/U/V/W/X/Y/Z - 8F/42J/304Y - 351.5t MTOW
-EGA/B/C/E/F/H/I - 8F/42J/304Y - 351.5t MTOW
-EPV/W/X/Y/Z - 8F/42J/306Y - 351.5t MTOW
-EQA/B/C/D/E/F/G - 8F/42J/306Y - 351.5t MTOW
-EQH/I/J/K/L/M/N/P/Q - 6F/42J/306Y - 351.5t MTOW
Aircraft without the aft overhead crew rest are limited to sectors < 12 hours scheduled block time - All 8F/42J/310Y and 42J/386T are configured without it and have a lower 340t MTOW.