Can you even get DPP4 to run in Ventura?Mine crashes immediately, and Canon Support says they have no idea when they will have a new version of DPP4 that will run under Ventura.
No, importing from the SD-card reader yields only a single copy, whether I just do a single image (select and chose "open with" into Photos) or mount the SD card reader in Photos and chose "Import all new"... Seems pretty analog to mounting the camer...
I did get the SD-card to read in the my MacBook Pro (15", mid 2012). There is only one copy of the photo in the card. Then again, this might be analogous to removing the other card before importing from the camera, which also causes Photos or Preview...