Need help with cleaning .NET core web api project with 2 request and 2 response with duplicate models

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C#

OOP

I'm having 4 similar models 2 requests, 2 response, and having trouble with duplicate codes, how to refactor models for clean code?

//The first Request
    public class RequestModel
    {
        public Participant Sender { get; set; }
        public Participant Receiver { get; set; }
        public Transaction Transaction { get; set; }
        public Security Security { get; set; }
    }
    public class Participant
    {
        public Institute Institute { get; set; }
        public Client Client { get; set; }
        public Account Account { get; set; }
        public Device Device { get; set; }
    }
    public class Institute
    {
        public long ID { get; set; }
        public string Type { get; set; }
    }
    public class Client
    {
        public long ID { get; set; }
        public string Type { get; set; }
    }
    public class Account
    {
        public long ID { get; set; }
        public string Type { get; set; }
    }
    public class Device
    {
        public long ID { get; set; }
        public string Type { get; set; }
        public string AcceptorDeviceAddress { get; set; }
    }
    public class Transaction
    {
        public string TRNType { get; set; }
        public int Amount { get; set; }
        public string Currency { get; set; }
    }

    public class Security
    {
        public string SecurityKey { get; set; }
    }

The second Request is the same as the first only difference is in this class

public class Transaction
{
    public string TRNType { get; set; }
    public int Amount { get; set; }
    public string Currency { get; set; }
    // new property
    public string OTP{ get; set; }
}

The Responses are the same as the first RequestModel class only difference is

public class Transaction
{
    public string TRNType { get; set; }
    public int Amount { get; set; }
    public string Currency { get; set; }
    // new property
    public string ResponseCode{ get; set; }
}

What I have tried:

Tried nesting classes, inheritance, abstraction but didn't succeed with normal result.