Hello
You should be able to remove the service packs from your PC.
Please note that you will not save 1Gb of memory on your disk but 500Mb.
The two FSICEBASE service packs are installing same files in the same location on your host.
I never tried to remove a service pack separately from a main installation. If you are experiencing troubles afterward you may have to do a repair on your CW V3.1 installation.
But this should not happen.
CrasyCat