The 9x57 will also feed perfectly in an '06 action, with about any bullet weight or length, afterall, the rails are meant for that case.

In the M98 action, both have similar operating pressures, however the 'improved' shape of the 9.3x62, more like an Ackley Imp case, will allow higher pressures due to reduced bolt thrust(reduced case body taper). This is all pretty much acedemic though.

As loaded around the world, the 9.3x62 is held pretty much to 1920 low pressures, whereas the 9x57 is lower yet.

Since the 98 will allow normal modern pressure, both can be increased in velocity, considerably.

The 9x57 will just about match .35 Whelen factory ballistics if loaded by someone who has a great deal of handloading experience and knows what they are up to.