It's the same thing.
The staff has to review your case, and the time it takes varies greatly, so there's no way to give you a specific answer.
Some cases are resolved in a few hours, others take weeks, and in some cases, if it's determined that you've violated a rule, they simply don't lift the ban.
For additional information to give you some context: Itch doesn't usually review or approve posts (that's why there's no waiting period). By default, you can post.
If an algorithm that Itch uses determines that your posts are suspicious, it blocks your posts until they are manually approved.