The difference in this process is the different taste, different nutritional components and different prices.

1. Lee Kum Kee oyster sauce has different tastes: Jiuzhuang oyster sauce has a rich taste; Caishen oyster sauce has a delicious taste; Umami oyster sauce has a lighter taste.

2. Lee Kum Kee oyster sauce has different nutritional components: Jiuzhuang oyster sauce is rich in nutrients; Caishen oyster sauce is moderately nutritious; fresh oyster sauce is low in nutrients.

3. The prices of Lee Kum Kee oyster sauce are different: Jiuzhuang oyster sauce is more expensive; Caishen oyster sauce is moderately priced; fresh oyster sauce is cheaper.