Land-use and soil parameters are 'generally' the same between NCEP RUC and multiple FSL RUC versions, with the exception that the coastline definition in the dev2 FSL run is slightly different. This coastline definition will be changing in all of the RUC versions within the next few weeks. Differences in surface temperature between the dev or dev2 RUC from FSL vs. the NCEP RUC are more likely ascribed to the vertical advection of moisture difference (also changing in the NCEP RUC in a few weeks), giving a higher soil moisture, or possibly to the radar reflectivity assimilation in the dev and dev2 runs. There is a little more info about differences between the different RUC versions under the FAQ at http://ruc.fsl.noaa.gov/RUC.faq.html
Does this help?
Original question from Jack Glendening:
Are the land-use (including soil) parameters identical in the "NCEP RUC"
and "FSL RUC" models, so that surface temperature differences between
the two cannot be ascribed to those parameters?