Forms for two websites

I saw the solution to the original same question, but I don't understand.

I'm creating only inline forms.

I noticed you have to include the universal code on each site, but the code is the same, so I'm getting the original website's form, not the new one. AND it subscribes to the original site, not the new one. (new addition to my original post)

How do I fix that?

The two inline forms DO have unique codes, but the universal is same.

Thanks in advance for any help!