I don't think they are the same at all. Bitium is a single sign on solution for Enterprise. Your employee creates a bitium account and then you Grant access to their bitium account to all the necessary services. Like AWS, Dropbox, whatever. Allows you to automate the onboarding process and also easily manage and cut off access to employees when they leave the company.

I actually haven't used it myself. But I was in the same accelerator as them a few years ago in LA.