The fight scenes are different because there were different stunt coordinators. In EP IV we see a classic Kendo style duel. Very clean and percise movements with very little flash.
In the Prequal movies we see more of a flashy Chinese style with frivolous flips twirls and blade spinning that look good on film, but are hardly realistic.
BOW DOWN BEFORE the Official Forum Pun-isher
Official XWA flight instructor
get busy with it!