sql server通过orm在不同的dbconnection中使用相同的transaction

var dbFactory = new OrmLiteConnectionFactory(
"Data Source=ds_server_a;Initial Catalog=catalog_a;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False",
SqlServerDialect.Provider);

        var otherDbFactory = new OrmLiteConnectionFactory(
            "Data Source=ds_server_b;Initial Catalog=catalog_b;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False",
            SqlServerDialect.Provider);
        try
        {
            using (IDbConnection db = dbFactory.OpenDbConnection())
            {
                using (IDbConnection db2 = otherDbFactory.OpenDbConnection())
                {
                    using (IDbTransaction tran = db.OpenTransaction())
                    {
                        db.Insert(new BaoLi2136 { Id = 2140, content = "Employee 1" });

                        db2.Insert(new Bl2136
                        {
                            id = 2140,
                            phone = "123123123",
                        });
                        tran.Commit();

                    }
                }
            }
        }
        catch (Exception ee)
        {
            Console.WriteLine(ee.Message);
        }

这里有两个库ds_server_a/catalog_a和ds_server_b/catalog_b,如何可以使db和db2使用同一个transaction呢？
ps:我这里使用了servicestack.ormlite的库。另外，不能使用TransactionScope。
请赐教！