what is the difference in usage of انْ and انّ?

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Actually there are many variations on these, i hope you don't get confused

There are إنَّ and أنَّ (Both come with Shaddah on the noon) used to emphasize a meaning, except that إنَّ can occur at the beginning of the sentence (and that's in the majority of cases) or even in the middle, on the contrary أنَّ occurs only in the middle of the sentence and you can not start with it. let me show you some examples to make it clear :

Indeed, Allah is oft-forgiving, most merciful : إنَّ الله غفور رحيم
I knew that you'll definitely not going : علمت أنك* لن تذهب
______
(أن + ك)

While, there are other variations like أنْ and إنْ (both with Sukoon on the noon)

أنْ Is often used to say "That"
Didn't you said that it will be rainy today : ألم تقل أن الطقس سيكون ممطرا اليوم

إنْ Is often used to say "if"
If you be patient it is better for you : إن تصبروا خير لكم

These are the two commun using of أنْ and إنْ but there are more with different meaning. I'll settle with this so you can at least catch what i already explained.

I hope it's a bit clearer and sorry for my awful English :)