How do you change the rule tile code to allow two different rule tiles to connect?

I am creating a city builder within unity using its 2d extras rule tiles. Currently, I am trying to figure out how to connect two different rooms together and have it generate a sort of doorway. However, the post I am using to help figure this out is really outdated and I don’t understand it. Here are the two different isometric rule tiles I am using. !- [1]

How would I manage to do this?

Thanks, Oregano

I used the sibling tiles rule from unity documentation: Custom Rules for Rule Tile | 2D Tilemap Extras | 1.6.0-preview.1