"its approximately same to what we had charged earlier?"
Hi! Kulkarni, welcome to the Forum.
You can not use "same to": because it is a phrase specifically used as a polite way of answering someone who has wished that something good happens to you. Example: A: “I hope you have a great new year.” B: “Thanks so much, and the same to you.” Here you can use “same as” meaning: identical to, like, in like manner to
It's approximately same as what we had charged earlier.