1. Grape variety and origin: The grape variety and origin used in Penfolds red wine in Hong Kong and the Mainland are different. Different grape varieties and producing areas will affect the flavor, aroma and taste of wine.

2. Brewing technology: There are differences in brewing technology in different regions, including fermentation methods, aging time in oak barrels and aging time in bottles. These factors will affect the quality and taste of wine.

3. Climate and soil conditions: the growing environment of grapes in different regions, such as climate and soil conditions, will also affect the growth and maturity of grapes, thus affecting the quality and taste of wine.