It would be difficult to produce an exhaustive list of the differences between Creole and Melange. We can, however, include a brief examination of the most important incompatibilities between the two systems.
Creole's "type:" options have been replaced by Melange's "equate:" and "map:" options.
Creole's "access path" options have been replaced by "object-file:" and "mindy-include-file:".
The interface to "import-value" and "export-value" differ between the two systems.
Melange does not inherit type mappings from other "define interface" forms.
Creole does not import definitions from "recursively included" header files, even if they are referenced by definitions which are imported.
Creole does not support C vectors or "sub-structures" as first class objects.
Melange does not presently support callbacks, "export-temporary-value", "<pascal-string>", "with-stack-structure", "with-stack-block", or "alien-method".
Creole will never consider instances of two distinct statically typed pointer classes to be "=", even if they refer to the same address.