3 maps
Tek: #127 on the Classic ranking, 250 points. Nero: #130 on the Classic ranking, 210 points.
Tek and Nero share no map in any mode.
In short
One side only
Tek 1, Nero 2
Hardest Tek is missing: kz_key, a T2.
Tale of the tape
Maps by tier
Neither has taken a Classic record from the other.