Will this.sail fit?

Hi all. I saw this blue sail on craigslist. I have the yellow/orange sail. Is it safe to say that these sails are the exact same spec/size? My boat is from 1984 and I think my sail is original. Is the blue sail from the same time? (1984).

Would there be any reason that this sail won't fit my mast/boom?
Thanks for any opinions.
Jb