Can someone tell me the difference of running the apple diagnostic tool that apple has supply online vs the diagnostic they do at apple?

At apple when the "apple genius" check to see if anything is wrong with your macbook hardware.  They would connect an ethernet cable to the macbook and run there diagnostic.  Are there any difference between either diagnostic test.  And does the apple diagnostic test (the one that they supply instruction online) check all hardware inside?  I remember see there screen was much different from the diagnostic screen i just ran (which was all gray with a little progress bar.)

Apple Service Diagnostics (ASD) is very time-consuming and produces results that refer to service procedures not available to the general public. It is not available outside of authorized Apple repair facilities. Without supporting documentation, its results could easily be misinterpreted. Apple also has additional diagnostic procedures for certain specific purposes.
Apple Hardware Test (AHT) is faster and more superficial. It performs cursory tests that do little more than check for the presence or absence of operable hardware.
AHT has been superseded with Apple Diagnostics in Macs produced after June 2013.

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