"SQL Developer" vs. "SQL Developer Data Modeler"

Hi Everybody!
I'm using SQL Developer and I miss functionalities like re-engeneering of ER Models. As far as I know this is what the "SQL Developer Data Modeler" does. So my question is: Is the "SQL Developer Data Modeler" a complete replacement for "SQL Developer" or do I need both?
thank you in advance

Whoooops, sorry, I replied in the wrong thread -.-
My reply was meant to be in the thread about Designer EA2 and the non-versioned repository import (Import repository from Designer concerning non-versioned applications (EA2)

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