Hello, @Scott_Favre
In short:
These codes are both NCIt codes/SCUIs and CDISC SCUIs, therefore, the intersection is possible.
However, SCUIs used as concept_codes in CDISC are only a subset of NCIt codes/SCUIs, therefore some codes may be missing.
As @zhuk mentioned, CDISC wiki may bring some light on how the Vocabulary ETL was done (e.g., concept_code definition, names assignment).