Oracle counts a vCPU the same way on EC2 and on RDS, so the platform choice never saves you licensing money. What it does change is sysdba access, block size and file limits, who owns backups and failover, and the Multi-AZ setting that quietly doubles your BYOL count.
The assessment report grades syntax, not behavior. A four-tier breakdown of what AWS SCT converts cleanly, what it converts while silently changing meaning, what it only handles through the extension pack, what it refuses outright, and the whole category it never looks at.
All four Oracle Construction and Engineering products overlap on purpose, and three of them hold cost. The damage comes from owning two and never deciding which one is authoritative. A practical comparison by whose record each product holds, plus a decision procedure and the integration constraints nobody scopes.
Most Oracle to Aurora migrations don't fail loudly. They finish green, pass validation, and quietly hand you truncated LOBs, sequences stuck at 1, and empty strings that used to be NULL. Here are the four failure families to check before you cut over, with the SQL and task settings that catch them.