Yes. All Kajabi plans allow at least one additional user beyond the Account Owner.
Learn more about the Growth and Pro Plans at kajabi.com/pricing.
Note:
We do not recommend editing the same page at the same time as another Account User. If multiple Account Users are logged in at the same time and edit the same page, they will overwrite each other's work. However, if an account contains multiple sites, two Account Users can edit simultaneously, as long as they are on two separate sites and not interfering with each other.