Here are some options depending on the context:
For agreement:
* Agree
* Concur
* Sympathize
* Relate
* Understand
* Empathize
* Share the same sentiment
For shared emotion:
* Share the same feelings
* Have the same feelings
* Experience the same emotion
* Be on the same page
For similar opinions:
* Think the same
* Hold the same view
* Have the same opinion
For shared experiences:
* Go through the same thing
* Understand each other
* Be in the same boat
The best replacement will depend on the specific situation and the intended meaning.