Hi Amit,
If you are taking exam for the the first time you should go with the first one 081.
If you have already taken for older version of 080 then you can upgrade with the 082. The Sun Certified Web Component Developer for the Java 2 Platform, Enterprise Edition 1.4 Upgrade certification exam is for candidates who have already successfully completed the Sun Certified Programmer for the Java 2 Platform (any edition) and Sun Certified Web Component Developer for the Java 2 Platform, Enterprise Edition (310-080) examinations.
Hope it clears your doubt.
--Kalyani