The idea of rebuild is not the main idea, I know they were rebuilt. The "3" suffix is.
BTW, I have had a issue with firefox, it refused to be upgraded (I guess because of the same version?). I had to remove it first. This is not desirable.
Also proftpd - which pointed to some old dependency until I have removed it and at reinstall it did not ask for that. But I've lost the config. Is it any way to reinstall a package with upgrade of the binaries only and leave alone the configs?