RSA-SHA1 signature differs in JavaScript and PHP

I need to create a RSA-SHA1 signature in nodeJS, I am using the following code

const crypto = require("crypto");
const sign = crypto.createSign('RSA-SHA1');
sign.update(data);
const result = sign.sign(privateKey, 'base64')
console.log(result);

I'm double checked that my code result is true, I have same result with online tools if I select sha1WithRSA algorithm and I also get same result in PHP when I use openssl_sign function

I need to sign data for a bank API, Unfortunately they don't accept my signature and they have no NodeJS implementation

Also their documentation is a total mess, Here is the C# implementation of their document

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
rsa.FromXmlString(“<RSAKeyValue><Modulus>oQRshGhLf2Fh...”);
string data = "DATA";
byte[] signMain = rsa.SignData(Encoding.UTF8.GetBytes(data), new
SHA1CryptoServiceProvider());
sign = Convert.ToBase64String(signMain); 

Can someone help me to understand why my signature is not equal to the C# implementation (I don't check result of C# but their server written in C# and they don't verify my signature)

The following links to other official code fragments in PHP that together work with their server, but the result differs from standard openssl_sign function in PHP: index L211-L216, RSAProcessor L45, rsa.class L17-L22, rsa.class L63-L82.

1. Is their implementation a non-standard RSA-SHA1?
2. What's wrong with my NodeJS code that their don't accept it?

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