Each network site is separate and iNat doesn’t automatically redirect URLs from different networks. If you want to do it yourself, you just have to change .ca to .org, e.g. https://www.inaturalist.org/projects/regional-parks-snap-share-2022?tab=about
There is already an existing feature request for automatic handling of domains, you can vote for it here: https://forum.inaturalist.org/t/stay-within-your-inat-network-affiliation-domain-when-clicking-links-to-other-inat-network-sites/6898
And if you want something automatic before then, you can use @benarmstrong’s instructions in that topic.