As for appstores, I assume you're talking about the packaging systems, which are similar only if viewed from 50,000 feet.
The packaging systems were not stores. You couldn't buy packages. They didn't serve as an agent to sell other people's personally submitted packages. They had "apps" but no "store". The applications weren't sandboxed to make it relatively safe for them to sell 3rd-party submitted packages. The applications were expected to be open-source.
The only similarity to the app stores is that they had a repository of software and an automated installation system used to install it.