SecretKeySpec mac and base64

I have a secret key which is already in base64 format.

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.SecretKey;
import java.security.Key;

              String key = "<base 64 encoded string>";
              String key_1 =  Base64.decode(key);
              try {
                  Mac mac = Mac.getInstance("HmacSHA1");
                  SecretKey secretKey  = new SecretKeySpec(key_1.getBytes("UTF-8"),"HmacSHA1");
                   
                  mac.init(secretKey);
                  String enc = new String(mac.doFinal());

                  // Base 64 Encode the results
                  String retVal = Base64Codec.encode(enc);
                  System.out.println ("result: " + retVal);
              } catch (Exception e) {
                  System.out.println(e.getMessage());
              }

The output I am getting  "result: "  is not matching with the output when I execute an equivalent code in python

I am sure something to do with byte array conversion in java and string but cant figure it


NOTE: If I don't do base64 decode and use "new SecretKeySpec(key.getBytes)"
then the output of "result: " is same in java and output from python code.