Connect to SAP BW?

We have Celonis EMS connected to our SAP ECC system and there is a request to also connect it to our SAP BW system to bring a table of forecast data which will be joined with the ECC data.

Should this be connected as another ECC system (e.g. using a system/instance id) or as a HANA system?

We don't need predefined business processes since there are not any, in BW. Just to extract specific tables.

When we originally set up the ECC Celonis extractor there were several transports that needed to be imported into the ECC landscape in the \\CELONIS\\ namespace. Trying to understand if these same transports need to be moved to the SAP BW system as well.

Thanks, Aaron