Yes, the Workspaces feature allows you to share specific migrations with other users.
To access Workspaces, go to:
https://migratemycrm.syncmatters.com/workspace
Then click Create workspace, as shown in the screenshot below.
Once your workspace is created, invite your team members or end customers by adding them to the workspace.
After users have been added, return to your migrations list:
https://migratemycrm.syncmatters.com/migration/list
From there, you can assign specific migrations to the workspace. This will make those migrations accessible to all workspace members: 
After that, all members of the workspace will see the migration under their accounts and will be able to edit it.
Workspace members have the same permissions as the migration owner and can perform the same actions. However, if a member initiates a full migration, the cost will be charged to the workspace owner’s MigrateMyCRM account.