Customize Which flow.xml files to load based on Brand

Hi all,

Can someone point me in right direction for how I can load a specific flow.xml file based on brand (or some other condition).

For example

I want to use the same endpoint for 2 of my brands but load different flows for each.

Example:

https://myredwebsite.com/context/endpoint.htm

https://mybluewebsite.com/context/endpoint.htm

Up to now both of these endpoints have been setup to load the same xml web flow, lets call it /folder/endpoint.xml
But now I want to change mybluewebsite to load a different xml file to use as its flow

/someotherfolder/endpoint.xml

How can I accomplish this? I'm specifically looking for direction on how to load the correct xml file, I have the logic to determine which file I want... Just don't know how to load the correct flow.

Thanks