Different PDF extensions?

Are there different PDF extensions that are essentially the same format? I want to open some of my pdfs with acrobat and some with an internet browser but don't want to reset assignments every time. I figure if it is seen as a different file type I can split that up.
 
The way it works is if you open a pdf file that is already on your computer, it should open it in adobe. If you open a pdf file via internet browser, then the browser itself has a plugin that will view the pdf like chrome and firefox does.
 
I don't know how I did it (need to look) but somehow when I open a PDF via the downloads section in Chrome, it opens in both Chrome and Adobe :?

Having said that, you cannot split between the two if you double click on the file. It will go to your default application. With extra steps, I would recommend Beers's suggestion once it's downloaded.

But if you don't want to have extra steps, I would say only open in the browser if you are just viewing/printing, unless you a) have an Adobe subscription with Acrobat and you need to edit PDFs, or b) you are trying to view a form that the browser's PDF cannot read properly. It's been a long while but this was something of an issue when I was working for an university where they had PDF files that were forms with special items (drop downs I think, or some formula/script) and the browser said to download Adobe Reader (which was installed... and the default) so the resolution was to download the file then open the file.
 
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