ELAC DBR62 vs KEF LSX

A speaker sound comparison between the ELAC DBR62 and KEF LSX speakers. Song credits to Chicago. Music is Master quality from Tidal. The Elacs are using a Mac Pro to USB DAC into a Realistic STA-95 vintage receiver with all tone controls set to neutral. The KEFs are using a Mac Pro via optical cable to the speakers. They have been optimized via the KEF app for room size, etc. Note: sound and video are from a iPhone X, and YouTube does compression on uploading. However, speaker sound differences should be noticeable. Can you tell which is speaker A and Speaker B??