Yes, i realise that rivals isn't a great choice of words but I couldn't think any over word. Anyway, which characters from MK and Injustice do you think are most similar. Like, for example, "I think Lex Luthor's moveset is most like Cyrax." Compare all characters other then, Kratos, Freddy and Scorpion (Injustice). My guess would be
Kabal and Flash
Skarlet and Catwomen
Jax and Bane
Scorpion and Batman
Sub-Zero and Superman
Ermac and Green Latern
Stryker and DeathStroke
Cyrax and Lex Luthor
Quan Chi and Raven
Sonya Blade and Batgirl
Kung Lao and Nightwing
I coundn't really find a good pair for the rest. Hopefully you can
Here's a link a roster list
http://www.eventhubs.com/tiers/mk9/
http://www.eventhubs.com/tiers/injustice/