TL;DR -- Different Templates, no way to be compatible
First off, that other app uses a key generator, which PasswordMaker doesn't have. The output of that key generator is what you would put in the master password here.
What is passes to HMAC-SHA-256 is DIFFERENT anyway. First, it starts with the appID that some mobile apps would use in the background which could be used here, then the length of the site, which I'm not sure if we can add.
Then it's the encoding step. At the start, this app had a simple binary to hex conversion, then switched to something else to allow more characters, but at heart, it's still a binary to whatever you would call the character set. NOTHING can be done about this.