Eclipse help says: [Synchronized] Both copies of the application files on the server and in the workbench are matching. [Republished] The copy of the application files on the workbench has changed and does not match the copy on the server. The server needs to be updated.
Eclipse help says:
[Synchronized] Both copies of the application files on the server and in the workbench are matching.
[Republished] The copy of the application files on the workbench has changed and does not match the copy on the server. The server needs to be updated.
I think it is a good idea to follow this.