Performance should be the same (same architecture and transistor count), but because of the smaller node used by Samsung, the A9 produced by them should a little cooler than the TSMC one.
Spotting which one is from TSMC or Samsung could be pretty difficult, since the temperature difference between chips could be less than 1-2 degrees.
Further investigation should be made with a X-ray microscope, the see the real differences between both manufacturers.
Once they have, you'll be able to view a graph of their reputation gained over time.
Here's a preview of what the graph will look like:
No reputation gained yet.