There is a Conversion guide in the Quarter master book. I've been using the frenzy die, so is frenzy die and hit location are doubles, then ability triggers. pain can change based on game master converting them, the standard is Average Damage of Monster being converted is pain, which is pretty vague, like the ose dragons average would be 10.5(3d6) or 5 {2 x (1d4 +1)} , but in beasts and brutes its a 9. so it seems pretty much left to dm or group discretion.