I was able to make Kali Terminal look the same on Ubuntu.
1. Install terminal: sudo apt install qterminal zsh
2. Copy over the ~/.zshrc from Kali to Ubuntu
3. Change your default shell to zsh, from the terminal: chsh -s /bin/zsh
4. Log out of your system and back in.
5. After placing the ~/.zshrc configuration file run the following commands from the terminal.
autoload -Uz compinit promptinit
6. Install zsh-autosuggestions: sudo apt install zsh-autosuggestions
7. Copy over all the files from your Kali system in the directory /usr/share/qtermwidget5/color-schemes/* to the same location on your Ubuntu system.
8. Install firacode fonts: sudo apt install fonts-firacode
9. On your Ubuntu system go Qterminal preferences: Change the color Scheme to "Kali-Dark" and click apply. Also if you want other settings the same from your terminal just copy the settings over by comparing the Kali Qterminal to the Ubuntu and select/unselect as needed including "Fira Code 10pt". Also at the bottem of the Appearance settings of your terminal change the "Application transparency" from "0%" to "5%" which is the same as on Kali and click apply.
10. If you want you can even copy from your Kali system the themes directory under: /usr/share/themes/Kali-dark to your Ubuntu system ~/.themes.
11. Install lxappearance: sudo apt install lxapperance
12. Launch it and from there you can select "Kali-Dark" Not sure if this will work since they may be using different theme libraries qt5.
However the terminal part should work, the end result will be your Qterminal look like Kali's. You can then still install neofetch on both systems and compare the different parts and look for the parts on the Ubuntu system that aren't the same as on the Kali system and copy them over where needed. Then once copied over selecting them through lxapperance as wanted.
The end result should look like this which I find exactly similar since all the terminal settings are copied exactly as they are from Kali to Ubuntu.
P.S It also seems like the copying over of the themes and selecting it under lxappearance gives the full effect of the Kali look, because the the Gnome Appearance selector doesn't seem to allow you to select custom themes. Without it terminal doesn't look transparent. Lastly I just did this while I was watching a series and having a drink. This worked for me and should work for you, if it doesn't work for you you did something wrong and don't ask me what you did wrong. You should be able to figure out that part yourself because I basically wrote out of what parts are needed for it.