How to create composite key and ensure the same property in 2 model

Question

I have 3 model

public class UnidadeNegocio
{
    public int Id { get; set; }
    public string Nome { get; set; }
}
public class Cliente
{
    public int Id { get; set; }
    public int UnidadeNegocioId { get; set; }
    public string Nome { get; set;}
}
public class Venda
{
    public int Id { get; set; }
    public int ClienteId { get; set; }
    public int UnidadeNegocioId { get; set; }

    public float Valor{ get; set; }
}

I need to ensure that in the Customer and Sale table, both contain the same Business Unit Id. That is, they must be the same.

In Sql server, we create composite key

How I could create and solve this problem using Fluent Api of Entity Framework?