results in 502b vs 403a

I am a new learner to use GHGenius. I followed the instruction for 403a which is available on B.C website. with the same set data for corn ethanol, 502b generated much better (lower) CI than 403a.  I found the feedstock recovery and  the land management emissions are lower in 502b than 403a.is it correct?
403a uses IPCC 2007 GWP, do you know what is the recommended IPCC value for 502b in B.C pls?
In addition, does the land management emissions in Upstream HHV sheet mean iLUC pls? what is the iLUC for corn grown in US central pls?

Thanks for your time.
 

Hi Don,
thanks so much for your quick reply.
May I know what does the default setting refer to pls? is it the IPCC GWP 2013 value?  In US, CA greet model has iLUC for Corn at 19.8.
In B.C and GHGenius, does the corn have no iLUC penalty if using above default IPCC value? in what condition, the iLUC will be considered in GHG enius and BC LCFS pls?

in addition, our case is corn growing and ethanol production are both in US, and ethanol consumption is in BC, any iLUC for corn will need to be considered in this case pls?

Thanks for your time