clustering servers

I have clustered my 2 servers together in webmin, I have discovered that there are packages that are installed on one that are not installed on the other, and vice versa, is tehre a way I can syncronize the servers so that it will install the missing packages on both servers to they match. I clicked on one of the missing packages, and it gave me the option of uninstalling the package on the server that it was installed on, but I can’t find a way to syncronize the 2. I know you can install a new package on both using the install option, is there anyway to use that to syncronize both servers?