2020 to 2023 facial recognition

My preference would be to keep the earlier version installed until everything is up and running with the new version.  (I have versions 4 and 10 through 2023 installed on my main computer.)

Also, be aware that Adobe offers a 30 day refund policy.  I say this because, historically, Elements releases a new version at this time of year.  Also, in years past, when a new version is released within a short period after a user makes a purchase of the earlier product, the user can request a free upgrade if they act promptly. 

Each version of Elements is installed as a separate program.  However, you are entitled to an "upgrade" discount as a prior owner.  I recommend that you choose to convert your catalog when offered that opportunity upon first launch of the Organizer (unless you are having some problems with your current catalog).

IMO, there has been a significant improvement in facial recognition between the two versions, both in speed and accuracy. 

There are many other new/improved features since Elements 2020.  You can find them listed here.

If that is your only factor in upgrading- no it's not worth it.... facial recognition is the same in either version.