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It's impossible due to fundamental DNS rules. (This is not specific to Marketo.)
The click-tracking (branding) server and landing page server are different machines running different, mutually exclusive code.
A single hostname cannot, in practice, be an alias for 2 different CNAMEs providing different services. Though you can technically create such a setup, it will not work because people will randomly connect to one of the 2 CNAMEs, and 1/2 the requests will fail.
(I'm simplifying somewhat because a reverse proxy functions as "an alias for multiple machines providing different services." But there's no proxy in the mix here.)