Hi Alessio, I would say these are two questions, yes for exiobase a launcher is needed, and for getting CO2 eq. results over the life cycle following hte EN15804 standard, you can use the EN15804 add-on and the respective method in this database, or maybe also exiobase if you use the LCIA method that is suited for EN15804 (especially, biogenic carbon uptake reduces the CO2 eq.). How exactly the CO values in exiobase are obtained is not nicely documented though I would say.
I hope this helps, best wishes, Andreas