Hi Huha,
Welcome aboard.
Sorry, I'm not a Jet specialist
& my English is not as good as I wish, but according to what I believe :
- the Super 530D is longer in size than the 530F ;
- the principal 530F wings are broader than those of the 530D ;
Unfortunately, I've no more details and no real knowledge on colour differencies...
About the yellow rectangle between the silver rings, I guess that is a "missile bon de guerre" (ready for war).
I've check French magazines and books and each time the caption told about a plane flying over Gulf, Afghanistan or ex-Yugoslavia, I can see the same yellow rectangle on 530 or Magic.
I suppose that photos in the walkaround are inert missile.
Maybe a French specialist, speaking English, could confirm the info in a close future ?
Hope it helps,
Casper.