Once stamped with the CASA OK
your CASA approved Part D
CASA do not approve any thing in Part D. If it shows compliance with the requirements of the Compliance Statement, it is just accepted by the FOI who reads it as part of the process. However, this does not mean that the next FOI will accept it.
However, a Part C required under CAR217 differs in that the training and checking procedures included in that Part C requires approval.