Galileo returns only these two non-stops:-
MON 20OCT03 PARIS /JOHANNESBURG 20/0000 20/2359 G*GAL
1 CDG JNB 1925#0620 SA 273 J2 C1 Z0 Y0 M0 B0 K0 H0 S0 Q0#743 B
2 CDG JNB 2325#0950 AF 990 P9 F9 A9 J3 C3 DL ZC Y8 K3 HL#744*C
So it looks like there's no codesharing going on on Monday night.