To be clear. You want to use data exported from JDE in CSV format to import into JDE, correct?
The general accepted practice for importing data is to use some form of a UBE in order to validate data, ensure default values are supplied for missing fields, etc.
Unless you know your data and table structures really well I wouldn't advocate the SQL Developer approach. For instance - how do you plan to handle the JDE Date formats and Numerics with decimal values?
Just a couple thoughts,