Linking to an external munchkin.js
On some webpages I see a link to marketo.net for the Munchkin deployment rather than normal tracking deployment as described here: Add Munchkin Tracking Code to Your Website - Marketo Docs - Product Docs
On some page the code links to:
https://munchkin.marketo.net/munchkin.js
https://munchkin.marketo.net/151/munchkin.js
I assume the folder deployment is for a specific Munchkin version, but can someone tell why we would deploy Munchkin in this way and how it's connected back to our instance if it doesn't have a munchkin id connected to it? At the moment we seem to have multiple codes and I want to removed unneeded if they are historical.