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The two vaccines (Marek's & coccidiosis) are for two different things and one has nothing to with the other. You can give the marek's vaccine and the coccciodiosis vaccine, one or the other or neither.
If you feed medicated feed to a chick already vaccinated for coccidiosis, nothing bad will happen; except you have wasted your money because both the med. feed and the vaccine do the same job. They prevent an overwhelming infestation of coccidia while allowing the chick's immune system time to develop an immunity. Coccidia is a parasite, not a disease. Marek's is a disease.
The common medication in medicated feed is amprolium. It's a coccidiostat, not an antibiotic.