I am suggest you to customise footer template and, in that you can check which website currently running,

Let's say:

Website-1

Website-2

currently Website-1 is running

you can check in footer template, there is a default variable accessible in qweb called website, based on that you can do this.

Let's say you have two footer template then

<t t-if="website.name == 'Website-1' ">

<t t-call="footer_template_1"/>

</t>

<t t-if="website.name == 'Website-2' ">

<t t-call="footer_template_2"/>

</t>

I hope it will helpful for you

Thanks and regards

Haresh Kansara