Hi there and welcome to the Community, @Interact_IT 
You’d like to use a single Instagram Feed widget with the flexibility to specify different sources depending on the webpage where it is placed, right?
If you are going to use your widget on pages within one website, the dynamic source option should work for you.
This feature is available only for Enterprise customers. If you’d like to learn more detail, please contact Elfsight Support Team .
However, if you are going to use it on pages of different websites, the only solution is to create a separate Instagram Feed widget for each website.
Let me know if you have any questions left 