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According to Juan Rendon, no. The 9.0.19 client needs a 9.0.18 or 9.0.19 EM Server.
See this post for more info -
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What about using V9.0.0 client to connect to V9.0.19 servers? During the interim period when the 3 environments are different, you can make use of V9.00 client to connect to all of them. This is because after a Control-M/EM server is upgraded to 9.0.19, Control-M/EM is in Compatibility Mode and older Control-M clients (from 9.0.00.000 and higher) that weren't upgraded can still work with the upgraded Control-M/EM server. However you can't make use of the new features yet. Once all your EM servers have been upgraded, you can then turn Compatibility Mode off in CCM for all your EM Servers and start using V9.0.19 client only.
That is a good idea. Thanks for passing it along!