Can I compare the data imported from Google Analytics with other sites in Matomo?

No, it is not possible to compare the data imported from Google Analytics with any other site in Matomo.

When importing data from Google Analytics, only pre-processed reports are imported and raw data is not. As RollUp queries the raw data, it is not possible to compare other sites with imported data.

Previous FAQ: Will the reports be shown in the Matomo Mobile app for Android and iOS?