They fit the same, only the markings are different.
I order this shirt in a large size, which always fits me, but this one was too small. I liked the color so I decided to try again, this time I ordered 2XL and it was exactly the same size just with the 2XL tag. Really?6
Pros
Light and comfortable, but due to the wear and tear of the fabric, "knitting balls" are obtained.