• OpenCV =4.1.0
• Operating System / Platform => Windows 64 Bit
• Python = 3.5.6

Code:
https://github.com/opencv/opencv/blob/master/samples/python/stitching.py
https://github.com/opencv/opencv/blob/master/samples/python/stitching_detailed.py

I try to stitch 3 images using above sample code, but get different results, stitching.py is more better than stitching_detailed.py.
There is no change for these sample code and use default parameters.

stitching_detailed.py result

stitching.py result