compare two time series datasets based on their ARIMA model

Hello, I have 7 sites that has continuous metabolism results (GPP, ER). the data is autocorrelated and I was asked to fit an ARIMA model for each one to be able to compare them. I was able to create the models and I dont know how to say which sites have similar GPP and which are statistically different based on the ARIMA model structure/coefficients? I am attaching the results of the ARIMA model summary for each site. Looking forward any help

Thank you

Karoline