sing the same song —(also: tell the same tale) express the same ideas or opinions as another person:
- After you have been here twelve months, you will sing the same song as I do now.
speak the same language —(also: talk the same language) have an understanding with smb. through similarity of outlook:
- We no longer speak the same language. To them, terms like “democracy” signify the opposite of what they mean to me.