Thanks. I did the same thing but copied them to a secondary hard drive and found there is a repository via ppa where you can download them from and install them in 22.04
This repository includes a variation of ambiant called Aqua. I don't know why it was removed but in matter of tastes nothing is written
sudo add-apt-repository ppa:lah7/ambiant-mate
sudo apt update
sudo apt install ambiant-mate-gtk-themes ambiant-mate-icon-themes
sudo apt install ambiant-mate-colours-aqua