As far as I am aware (happy to be proven wrong) EK can definitely operate a full pax load on a 3 class machine and I'm sure they can on the 2 class machines too along with a full cargo load from NCL-DXB.
I'm sure some of EK's more restricted routes the baggage allowance is/was 20kg as opposed to the usual 30kg, if there were serious issues I'd think NCL would be 20kg too.