It might be the same one! Does End!Dean wear it? I didn't record End!Dean's clothes the first time I watched the show, because I considered him the same as Wish'verse!Dean and that he'd have a wardrobe completely his own that we'd never see again.

Of course, that theory went out the window when I later recognized the Green Military Coat of Doom in 5x18, and had to quickly go back and add that in.

So, this is all to say that you're probably completely right and I should add in the fact that End!Dean wore a beige henley.