I see that there are 2 mim cap model (sky130_fd_pr__cap_mim_m3_1 and sky130_fd_pr__cap_mim_m3_2) in sky130_fd_pr. However in the documentation of skywater-pdk there I see 'sky130_fd_pr__cap_mim_m3__base' and 'sky130_fd_pr__cap_mim_m4__base'._ Which one should be mapped to 'sky130_fd_pr__cap_mim_m3__base' and 'sky130_fd_pr__cap_mim_m4__base' respectively ?

I think "m3_1" and "m3_2" may have been a misnomer or typo. The "m3_1" device corresponds to the "m3__base" model and "m3_2" device corresponds to "m4__base" model.

Thanks @Tim Edwards for clarification.