Ok, so I'm several days late on this, but I just had to post a little something about this.
Happy Diwali! (Diwali Mubarak)
Happy New Year! (Sal Mubarak)
As a Gujarati, only the second wish is common place. I never grew up wishing people a happy Diwali since our family cared more about the next day, which is new year's day in the Hindu calendar. But since college I've been exposed to the variation of Hindu culture and I receive Diwali greetings all day, but I tend not to wish anyone a Happy Diwali.
Not because I'm a stooge, but simply because I'm used to wishing people a Sal Mubarak.
I confirmed this with several Gujarati colleagues yesterday (which was New Year's Day), so I can truthfully say that most Gujarati operate this way. We wish each other Sal Mubarak and go to temple on new year's day and go out to each on new year's day and call everyone on new year's day and generally make a big to-do about new year's day.
Diwali? Eh...light a diya and be done with it :)
Anyways, just a light hearted way of explaining how we Gujaratis are even wierder than you thought ;)