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IMapper mapper = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<Person, PersonCar>();
    cfg.CreateMap<Car, PersonCar>();
}).CreateMapper();

mapper.MergeInto<PersonCar>(person, car);

public static TResult MergeInto<TResult>(this IMapper mapper, object item1, object item2)
{
    return mapper.Map(item2, mapper.Map<TResult>(item1));
}

public static TResult MergeInto<TResult>(this IMapper mapper, params object[] objects)
{
    var res = mapper.Map<TResult>(objects.First());
    return objects.Skip(1).Aggregate(res, (r, obj) => mapper.Map(obj, r));
}