SHA256 Behave Differently In c#

I need to pass a SHA256 hash to some 3rd party API. They have even provided a sample in JS which works fine and the results is matched with online SHA256 generator like this one:

• https://codebeautify.org/sha256-hash-generator

But the problem occurs when I use C# to generate the SHA256 hash.

I’ve matched almost everything like input, encoding; etc.
But I’m not exactly sure what the issue actually.

Please check the input which behave differently below

Input

{
  "correlation_identifier": "Payee Validation",
  "context": "PAYM",
  "creditor_account": "23124812341",
  "creditor_name": "NARUMATT",
  "uetr": "3c9e595f-07d8-4f56-ae80-8edbb7683d59",
  "creditor_agent": {
    "bicfi": "BSALSVSS"
  }
}

Online Results

a425b580c44e2c3ba6ce213529818feea5bd7ccfd76ccd02171c87ff1e53c8ee

C# Results

b192e9203176649de967fa4cbe9e513a77fc29797981ea1ce93e6e07e5dd94e3

c# Code

       string inputString = JsonConvert.SerializeObject(new Input()
            {
                correlation_identifier = "Payee Validation",
                context = "PAYM",
                creditor_account = "23124812341",
                creditor_name = "NARUMATT",
                uetr = "3c9e595f-07d8-4f56-ae80-8edbb7683d59",
                creditor_agent = new CreditorAgent()
                {
                    bicfi = "BSALSVSS"
                }

            }, Formatting.Indented);

       string base64Hash = GenerateSha256(inputString);
       static string GenerateSha256(string inputString)
            {
    
                var hash = new System.Text.StringBuilder();
                using (SHA256 sha256 = SHA256.Create())
                {
                    byte[] hashBytes = sha256.ComputeHash(Encoding.UTF8.GetBytes(inputString));
    
                    foreach (byte theByte in hashBytes)
                    {
                        hash.Append(theByte.ToString("x2"));
                    }
    
                }
                return hash.ToString();
            }
    

JS Sample

var CryptoJS = require('crypto-js')
var reqBodyUtf8 = CryptoJS.enc.Utf8.parse(pm.request.body.raw);
var reqBodyDigest = CryptoJS.SHA256(reqBodyUtf8).toString(CryptoJS.enc.Base64);