ACS Profile data variables

Hello-- I'm new to ACS and am conducting analysis on percent employment by census tract.  When I look at the API link for ACS 2010 5 year estimates, I don't understand the difference between data profile "DP03_0002PE" which indicates Percent Employment Status  In labor force and data profile DP03_0011PE" which has exactly the same description.  Could someone shed some light on this?