Difference between succession certificate and heirship certificate

We are two brothers residing in Mumbai, we have several share certificates which are in the name of our deceased father, how do we get these transferred to our names? Do we need a succession certificate or a heirship certifiate? which authority should we approach?

Please be kind to inform us the difference between succession certificate, heirship certificate and letters of administraction for our information. 

Thanking you in anticipation.