Sharing URL's on Duplicate Project Pages

Site URL: https://echidna-gardenia-fcb4.squarespace.com/

I'm using the Pazari template and have created a portfolio page to showcase our work. Within the portfolio page, we have a number of images from the same project. When you click on these images, it takes you through the the detailed project page. 

To create each project page, I have duplicated the project. However, this leaves great room for margin of error as when you need to update info or change an image etc. you need to do so for each individual project page to ensure they all look the same. 

Is there a way to share the same url for one project across multiple portfolio images or a way to have one master page per project which all related portfolio images can link through to? 

I have attached a screen shot of the project page and the portfolio images for reference.

Any help would be great and thank you in advance!