03-02-2014 08:21 AM
They should be the same lens. I suspect they are just from a different "product run"
Here is a link that shows even more codes for the same lens: Canon product numbers
03-02-2014 07:46 PM - edited 03-02-2014 07:47 PM
When I Googled the ***006 number I got European online stores; the ***002 number produced US stores.
Also, the driver support pages for my camera and two printers all have a 002 number; I am in the US.
So, I am guessing the last three numbers may denote the market.