Yes, Barnstormer is in the exact same spot, and the did alter the last curve a bit to give more clearance for Dumbo. I think what might throw people off is that Barnstomer was always perceived as the first attraction on the right when you entered Toontown Fair - it was, but there was a walkway with trees on the right before it, that people probably can't picture because it wasn't anything special.
Now Dumbo fits in that space between the two northern curves (in track racing, they would probably be labeled turns 5 and 8) and comes right next to Barnstormer.
An easy way to see the changes is to use Google Earth. Zoom in to that area of Magic Kingdom, then click down the bottom to the right of where it says "Imagery Date", on the "1995". This will go into "time travel" mode. There will be a slider up the top that you can control what date you see the satellite images from. The last three are from 5/10/2010, 12/30/2010 and 1/3/2012, basically a "before" and "after" of Toontown, although while construction was still ongoing...The 5/10/2010 image is clearer than 12/30/2010, which is why I mentioned it.
You can see that Turn 8 as I'm calling it, which is a slight bend right before turning left (which would be turn 9) doesn't bend to the right quite as much before making the left turn towards the end.
If they needed to move Barnstormer to make room on that side, they probably would have just kept with the original plan which put Dumbo to the left of Barnstormer.
