In terms of coordinate system definition the CAL and DC file are identical. You can rename a CAL file to .DC and edit/view it in the DC-File Editor (is part of the Configuration Toolbox)
You should just take the CAL file from SCS900, copy and maybe rename it to .DC on your Access Controller and create a new job. You'll be asked to create "from template" or "JobXML or DC File". Using the second option you import your site calibration.
What you also could do is to drag your SCS900 site calibration file into TBC and add it as "Local Site" to your Coordinate System Manager.
Save the database as custom.csd and copy it into the Access System Folder.
In the older Versions that would be Trimble Data\System Files, in the newer Version something like "C:\Program Files\Trimble\Trimble Access Emulator 2020.00\General Survey"
Once you've done that your site calibration should be available under Job-Properties -> Coord. System -> Select from Library -> User Sites