[Koha] Two databases in Koha

Good day, I have installed MARC 21 database for testing, but now I would like to see the Unimarc as well. Can I have 2 databases, or do I have to de-install the MARC 21. What is the correct procedure to follow and not damaging my current installation. Thanks Renate -- Renate Morgenstern Windhoek, Namibia