RUMBLE IN THE BRONX: The R3 is longer and anamorphic with Cantonese and Korean as alternative language tracks (Cantonese is the original language it was filmed with the intent of using) while the local Nordic Region 2 version contains special features such as:

Interview With Jackie Chan
Trailers (New Line & Mirmax versions)
TV Spots (New Line & Mirmax versions)
Sneak Preview
Kung Fu - music video by Ash
"Deleted Stunts" - not actually true since it is just the end credit section where they show Jackie performing his stunts to various degrees of success (mostly with him becoming injured/hurt).