time-series - How to compare two non stationary time series

Question

I have searched a long time for comparison between non stationary time series but I'm a bit lost.

I have two time series (black and red below) and I want to prove statistically they are very similar.

This is the plot of my time series:

Could someone help me on the steps I need to perform please?

Answer 1

如果你想比较两个系列，你可以计算它们的相关系数，我认为这就是你需要的。