I have the following code:

public extension SymmetricKey {
    init?(base64Encoded base64EncodedKeyString: String) {
        guard let keyData = Data(base64Encoded: base64EncodedKeyString) else { return nil }
        self.init(data: keyData)
    }
    
    var base64: String {
        self.withUnsafeBytes { body in
            Data(body).base64EncodedString()
        }
    }
    
    init?(pass: String) {
        guard let passHash = passToHash(pass: pass) else { return nil }
        
        self.init(base64Encoded: passHash)
    }
}

fileprivate func passToHash(pass: String) -> String? {
    guard let passData = pass.data(using: .utf8) else { return nil }
    let hashed = SHA256.hash(data: passData)
    return hashed.compactMap { String(format: "%02x", $0) }.joined()
}

problem is if I will try to use SymmetricKey I will see error:

The operation couldn’t be completed. (CryptoKit.CryptoKitError error 1.)

This error means incorrect key size.

If I will try to compare SymmetricKeys generated with default way and from my custom init I will see difference:

5994471abb01112afcc18159f6cc74b4f511b99806da59b3caf5a9c173cacfc5 //from password
cfyk1v2dRIlVKHlpy8qBH71v4BXGSUHPUS3wLn1gzj0= //.bits256

What I’m doing wrong?
Why hashes are different?