#rat on

Yes there is a difference between the two.

Yes, there is a difference between snitching and telling on someone:

Snitching often has a negative connotation, implying revealing sensitive information about someone's misdeeds when you weren't directly affected by it. It suggests doing so surreptitiously behind someone's back and can be seen as betraying trust.

Telling on someone more neutrally conveys reporting wrongdoing that you witnessed or were affected by to an authority figure. It's considered appropriate to tell on bullying, cheating, stealing, etc. that you experienced or saw happen.

The key differences are:

Snitching is more informal, done secretly, and involves personal matters that don't directly concern the snitch.

Telling is more formal, done openly, and involves issues that directly impact the teller.