"bom_v2.0.3_board_ref_parts.csv" are the parts that can be directly obtained from the BOM output in kicad
"bom_v2.0.3_other_parts.csv" are ones that are part of more complex footprints, or peripheral parts
"digikey_bom_4-20-2023.csv" is the BOM to order from digikey. Must be kept in sync with the other files.
Use the "upload a file" option in digikey to upload the bom csv - see the image in this dir digikey_upload_bom.png