Create similar pages with select different words

Is there a plugin to create replicated pages but with slightly different words? Perhaps use replacement words using some sort of short code? This would be handy to blanket different cities for the same subject. That way I can target individual cities without having to clone pages.
Each time I update the text on one page, right now, I have to go through and change every pages (100+)! It’d be more efficient to change one page, then have it replicate with a database (?) of different phrases.