Does MacBook Pro 13" 2017 and 2018 with Touch Bar have the same bandwidth on all 4 ports?
Check this information I found on an article:


  "The 13-inch MacBook Pro (2017) without Touch bar has 2x full-speed
  Thunderbolt 3 ports / USB-C ports. The 13-inch MacBook Pro (2018) with
  Touch ID has 4x Thunderbolt 3 / USB-C ports and, with the 2018 model,
  all four of those ports are now full bandwidth."


I hope this answers your question.