Different physics parameters, output the same

[kwende]

I'm pretty green when it comes to mixing and matching physics parameters, so it's possible I got something messed up somewhere. I am experimenting with the following two sets:

set 1:
mp_physics="6"
ra_lw_physics="1"
ra_sw_physics="99"
radt="30"
sf_sfclay_physics="2"
sf_surface_physics="1"
bl_pbl_physics="2"
bldt="0"
cu_physics="2"
cudt="5"
isfflx="1"
ifsnow="1"
icloud="1"
surface_input_source="1"
num_soil_layers="4"
sf_urban_physics="1"
set 2:
mp_physics="8"
ra_lw_physics="99"
ra_sw_physics="1"
radt="30"
sf_sfclay_physics="2"
sf_surface_physics="1"
bl_pbl_physics="1"
bldt="0"
cu_physics="4"
cudt="5"
isfflx="1"
ifsnow="1"
icloud="1"
surface_input_source="1"
num_soil_layers="4"
sf_urban_physics="1"

Yet when I look at the precipitation output, the results are EXACTLY the same. To show what I mean, I created some MP4s of the precipitation for these runs. The first one is here: http://www.ben-rush.net/wrf/errors/seven_plt_Precip3.mp4, and the second one is here: http://www.ben-rush.net/wrf/errors/six_plt_Precip3.mp4.

Are some of these parameters incompatible with each other? Why would these two different sets return the same results?

Thanks in advance.