R93 is a little lighter and slimmer, has 3rd internal mag, is a legacy model and might be discontinued soon (no evidence for this, just a feeling since it's been superseded by the R8)
R8 has a 4rd removable mag that also drops the trigger with it, little heavier (stock + action ~100gms heavier than R93?) and fatter, has a larger action for safari cartridges, and the action has been redesigned a bit with different bearing angles on the collet lugs etc, and a slightly differently shaped stock (schnabel forend tip vs not)
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