Compared are the International Version and the Hong Kong Version. The Hong Kong Version (HKV) should be preferred because it's over 15 min. longer than the International Version (IV). Especially the final fight is really different (check out the other comparison).

Besides, the IV contains a different soundtrack, but then again it contains a few scenes, which aren't in the HKV.
6 differences = 169 sec

Note: This comparison was updated with timecodes and screenshots for the 88 Films Blu-ray, which was released on 22/02/2021 in the UK. It offers a new 2K restoration and three cuts of the movie.

Intro
The opening credits have been replaced. Instead of coming right at the beginning, the international version has them a few minutes later when the lion dance starts. Also they are blue and just in English.
No difference

International Version (88 Films Blu-ray Disc 2)	Hongkong Theatrical Cut (88 Films Blu-ray Disc 1)

11:41-13:46 / 14:00
In the evening, everyone's in bed. Some of them make fun of Jackie, others say it wasn't his fault that he'd lost. Jackie also sits there crying all the time. Jackie's friend Tiger, who performed the lion dance, says it wasn't bad he'd lost and passes him some ointment. The next day Jackie's friend does some training with a stick. Jackie asks him why he'd performed the lion dance for the others, but denies to respond truthfully. He just says he needed the money. Then he tells Jackie it's his turn to train. Jackie agrees and fidgets with the stick. Finally, he recognizes a pink flower and attacks it. After the attack, the flower flies up and Jackie gets scared. He tries to reunite the flower with the plant. The next scene, which shows the students in the shower, is also contained in the HKV.
125 sec

33:20-33:24 / 34:30
After Tiger takes down an opponent during the ambush, the international version offers another shot of Ah Suk. He watches the action from a hiding place.
4 sec

33:40-33:43 / 35:00
Again a shot of Ah Suk making a few crane movements with his hand.
3.5 sec

34:03-34:05 / 35:27
After Kam breaks free and takes down a guy in a wide arc, you see Ah Suk again. A bit intimidated, he ducks.
2 sec

66:33-67:07 / 70:21-70:23
The bad guys discuss next steps at a market. Tiger says he will check the bank again. When he's leaving, Ah Suk suggests to boss Kam that they could set him up after the bank robbery. Kam agrees and spits his toothpick out. The next scene is also contained in the HKV.
30 sec

74:28-74:31 / 78:56
After Dragon (wearing some cloth as a skirt) fends off an attacker, the international version has another shot of the cloth seller, who bobs along enthusiastically.
2.5 Sec

Credits
The credits at the end have been replaced as well, just like the opening credits.
No difference

International Version (88 Films Blu-ray Disc 2)	Hongkong Theatrical Cut (88 Films Blu-ray Disc 1)