Hello geir_j_voldmo
Thank you for posting in the community. Currently the Portfolium product has been rebranded under Canvas Student ePortfolios. So, to answer your question, they are now one in the same. We are still working on updating the documentation to reflect this change, so you still might see the Portfolium moniker in some places.
I hope this helps clarify things as we work to more fully integrate Canvas Student ePortfolios into the Canvas family of products.
Here is a link to the community page for guides and resources related to Canvas Student ePortfolios.
https://community.canvaslms.com/t5/Canvas-Student-Pathways-and/ct-p/portfolio