They're from the same day. The dates on them match, as do the other articles and ads.
I think they printed one before the speech and only released one, though it could be along the lines of the whoops you posted. Twitter's abuzz like the WSJ is catering to audiences or trying to sway minds. I don't think it's that.
An afternoon and evening release from the same day, maybe? That could make sense, too. I could see how they'd both show the same photo, but have one with content about the meet and the other before the talk.
I tried looking for this in snopes earlier and couldn't find it, but when I Googled "How many editions does the WSJ print each day" just now, I got this: http://www.snopes.com/wsj-different-trump-headlines/
They are two editions from the same day.
JA already posted that link Saturday inside a comment. :-)