When adding text to a Photoshop file you can choose to use any of the fonts that Photoshop ships with.
Additionally, Photoshop will also present you with any fonts that you happen to have already installed on your computer. That’s why the fonts someone else has available on their installation of Photoshop will ultimately differ from yours.
Adding Google Fonts
If you see a font on Google Fonts that you’d like to use in Photoshop, you can download it to your computer and have it automatically apply itself to your Photoshop installation.
The video shows you how to do this. Please note that I am using a PC running Windows.