I am hoping to do a run with some modifications from the standard CMIP6 SSP585 CESM2 run, and then compare to the CMIP6 run as a baseline. To do this, I am wondering which CESM tag I should use for my modified run? I see the tag release-2.1.5 has BSSP585cmip6 compset, but the SSP585 run for CMIP6 was done using tag cesm2.1.4-exp02. Any advice would be much appreciated.