Different Facebook pixels for each store/store-view/website

I have 4 shopify stores that I am hoping to convert into a single one using Magento. Far as I understand, it is possible to configure different prices, shipping methods, payment methods for each store.

What I have not any help with all the Googling is if I could use four different Facebook pixels each for the four stores.

So, any help with how to achieve it would be vastly appreciated.