Ok, I got the solution to this and it is as under:
Basically, one after the other (once for each camera), I went to my two network cameras DCS-5010L and DCS-933L over 192.168.1.101 and 192.168.1.102 and went to the settings -> Maintenance -> System -> Save config to hard drive. And save the present config.
I then did a "Rest to factory settings". Connect the camera via LAN and restored the settings.
Then went to mydlink Android App and it saw the camera as new and then offered to add to mydlink account to which I said yes and then I repeated with the second camera. Now both cameras show up for me in mydlink along with the DNR-202L which was showing up earlier. So all three now show up on mydlink account.
~ Suchit