The differences in Narwhal's and loki's playing styles are to a large degree the result of the forces they have at hand and the strategic challenges they face. In order to make most of Prussia's advantages (interior lines, superior speeds, better commanders) quick counter-attacks and shifts of troop concentrations are the logical choice. Granted, this seems to collude well with Narwhal's penchant for bold attacks.
On the other hand, Austrian players who know what they are doing will choose tactics similar loki's: in particular his idea of concentrated, mutually supportive corps should be standard feature in any Austrian player's repertoire. Some may strike more aggressively, some may try flanking marches of their own. But in the end, the goal is always the same: steadily tighten the screws on Prussia while avoiding stupid risks.