Yi
This is something you'll need to figure out. The CESM2 experiments database is here:
Multi-decadal model runs of given component sets at the target resolution, followed by scientific review of the model output diagnostics
csegweb.cgd.ucar.edu
You should be able to cross reference with CMIP6 to find the experiment names. I believe CMIP6 experiments are available on Globus, and there are restart files associated with them.