Sentence examples for the same plane from inspiring English sources

The phrase "the same plane" is correct and can be used in written English.
It is typically used to refer to something being on the same level or in alignment with something else. Example 1: "We both arrived at the same conclusion, but we got there from different angles. It's like we were on the same plane, but taking different routes." Example 2: "The two paintings may seem different, but they are actually on the same plane when it comes to artistic style and technique."