The Client and Services build can differ and still work as expected. It is best to keep them within the same minor build branch.
For example 184.108.40.2064 for the client and 220.127.116.111 are fine but 18.104.22.1684 and 22.214.171.1242 may not be. 6.4.1.x should be upgraded to a build within the 6.4.2.x range.
If you are in doubt on this, please contact support to verify that it is ok.