public class Unit
{
    public string Year { get; set; }
    public string Model { get; set; }
}

{
    "UnitYear":"2018",
    "UnitModel":"F250 Super Duty"
}

{
    "AssetYear":"2019",
    "AssetModel":"Corvette Stingray"
}

Unit1 : Year = 2018, Model = F250 Super Duty
Unit2 : Year = 2019, Model = Corvette Stingray

private static Dictionary<string, List<KeyValuePair<string, string>>> Units = new Dictionary<string, List<KeyValuePair<string,string>>>
{
    { "0000001", new List<KeyValuePair<string,string>>
        {
            new KeyValuePair<string,string>("Year", "UnitYear"),
            new KeyValuePair<string,string>("Model", "UnitModel")
        }
    },
    { "0000002", new List<KeyValuePair<string,string>>
        {
            new KeyValuePair<string,string>("Year", "AssetYear"),
            new KeyValuePair<string,string>("Model", "AssetModel")
        }
    },
};

Unit u1 = JsonConvert.DeserializeObject<Unit>(json, new GenericConverter("0000001"));
Unit u2 = JsonConvert.DeserializeObject<Unit>(json, new GenericConverter("0000002"));