That's not my understanding.
The TRAI DND app, on IOS, generates a pre-formatted SMS which is sent to the operator on the standard number 1909.
The Sanchar Sathi app sends it to a DOT entity which then routes it to the operator while updating the govt database of reported spammers and scammers. The options are much extensive than just a spam call/sms.
You can report that the individual was impersonating a public official etc while you can not do than at all with the TRAI DND app.
I suggest you try out the platform on their website first before commenting further.