The tie is a repeat of the 2005 final in which Ahly were also away in the first leg, holding on for a goalless draw before winning the return leg 3-0 in Cairo.
The Leeds-London tie, a repeat of the 1999 final, will be shown live on the BBC on Saturday, 1 March (1500 GMT), with the Wakefield-Widnes match also being shown live by the BBC the following day (1210 GMT).