Happy Dussehra OR Happy Ganga Dussehra...?!

Can anyone tell me if there's any relation between those two Hindus festivals?

I posted earlier a notebook entry according Dusshera festival but I think Dussehra is not celebrated the same day as Ganga Dussehra?
I guess I got it completely wrong!

Anyway, I wish to all my Indian contacts a Happy Ganga Dussehra as I've heard it's today that Ganga Dussehra is celebrated!

Happy Dussehra OR Happy Ganga Dussehra...?!

Can anyone tell me if there's any relation between those two Hindus festivals?

I posted earlier a notebook entry according Dusshera festival but I think Dussehra is not celebrated the same day as Ganga Dussehra? 

I guess I got it completely wrong!

Anyway, I wish to all my Indian contacts a Happy Ganga Dussehra as I've heard it's today that Ganga Dussehra is celebrated!