Phantom Premier/Phantom I Models and Versions - Please Contribute!

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In the last 7 years I owned a number of Phantoms, the first in March 2015 and the latest since today. Here are the serial numbers and purchase dates:

Silver Phantom H08ExxxxxEWM9, purchase date: 05.03.2015
Silver Phantom H08ExxxxxEWM9, purchase date: 05.03.2015
Silver Phantom H41ExxxxxEW02, purchase date: 30.10.2015

Gold Phantom J50Nxxxxx4U06, purchase date: 10.01.2017
Gold Phantom J50Nxxxxx4U06, purchase date: 10.01.2017

Gold Phantom P11Nxxxxx4U15, purchase date: 19.03.2021
Gold Phantom Q01Pxxxxx4U20, purchase date: 22.02.2022

So far I have not seen the latest version number 4U20, but I can not see or hear a difference (as for now) between 4U15 and 4U20.