It seems Frontier swapped accidentally stats for both ships, because Asp Scout has one class higher Power Coupling!, Sensors and Life support modules. While last two do not influence much having 2 small and 2 medium hardpoints on both ships then class 4 power coupling makes all the difference - Asp Scout can shoot longer than Viper Mk IV, which one is combat oriented ship here?
Asp Scout is slower (237 m/s vs 291 m/s), slightly lighter (150 tonnes vs 190 tonnes) with slightly worse shields (281 vs 318) and slightly better armor (630 vs 525). Both ships have 2 Utility mounts for shield boosters, heat sinks, kill warrant scanners and other utility modules. Jump range for combat variants are very close - 19,66 vs 19,43 and of course Viper wins here, naturally ;)
Both ships have a maximum of class 4 internal compartment which you can use for shields, maximum cargo without shields for Asp Scout is 52 tonnes, for Viper Mk IV - 50.
At 360 degree pitching with 4 pips to engines Asp Scout wins hands down - 8,6 seconds vs 12 seconds (0 pips to engines 10 vs 14), so Asp Scout pitches with 0 pips to engines faster than Viper Mk IV with 4!
I really hoped that Viper Mk IV will be improved variant of Viper Mk III but if even Asp Scout beats it in almost every way...There's still a hope that devs will tweak Vipers in 1.5 beta, BOTH vipers.