Difference between 'init without data transfer' & 'Use of No data transfer delta status in Source : Fetched' in DTP

Hi Experts ,

While checking delta options in DTP , I have found two similar option for INIT without data transfer in delta DTP .

1. In Extraction tab : Delta Init without data

2. In Execute tab :

Are they both same ?

while executing both DTP with same option , second option(Execute tab- No data transfer : Delta Status in Source : fetched) execute faster.

Please provide some knowledge on the difference between the two.

I have gone through some discussions but could not find any link where the difference between them is discussed.

http://scn.sap.com/thread/3535094

http://scn.sap.com/docs/DOC-31781

Please help.