WordPress Multisite User Sync/Unsync plugin can sync/unsync users from one site (blog) to the other sites (blogs) in your WordPress Multisite Network.

Types of WordPress Multisite Network

Multi-domains. For example: example.site1, example.site2
Sub-domains. For example: site1.example.com, site2.example.com
Sub-directories. For example: example.com/site1, example.com/site2