The distribution company Atlas International deemed it right to create a tightened export version with lesser story for the international market, as was done often before with Asian movies.
The difference of about 9 minutes consists only of irrelevant scenes which slow down the whole movie. The additional material with Lisa's admirer is just plain annoying and dumb and the other scenes "deepening" some characters (Eddy, Chang) are superfluous. Only an additional murder is interesting at first glance, although not that spectacular - the acting there isn't all too great.
In the UK the Original Version was released instead of the Export Version - unfortunately not completely uncensored. Half a minute, in comparison to the HK LD, was removed. Mostly shots in which drug consumption is depicted respectively cocaine is consumed from a naked woman's body were cut out of the sex scene at the beginning. Again one can find a detailed comparison here.
