They use the same connector, and are the same when using USB, HOWEVER, they are not all exactly the same on all models when using Thunderbolt.
On ONLY the Macbook Pro 13" touch bar model, two of the ports have higher bandwidth than the other two when using Thunderbolt 3.
According to the Apple Support document: https://support.apple.com/en-us/HT207256
MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) supports Thunderbolt 3 at full performance using the two left-hand ports. The two right-hand ports deliver Thunderbolt 3 functionality, but have reduced PCI Express bandwidth.
Always plug higher-performance devices into the left-hand ports on MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) for maximum data throughput.