Thank you and welcome to the forum 
For cachy update applet, try look into /usr/share/applications and search for cachy-update.desktop or cachy-update_updates-available.desktop file and see what is the icon filename set in it. You can share the icon filename here.
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thanks,
ive found cachy-update_updates-available-blue-cb.svg and cachy-update_updates-available-blue.svg here : /usr/share/icons/hicolor/scalable/apps/
i’ve also fount allready existing white icons in the same location. I’ve kept a copy of the green ones and renamed the white ones as juxstoposed did in her video.
And it works 
!!
it’s not much but i’m proud haha.
i don’t think i can upload svg files here so i’ve done it here : https://www.swisstransfer.com/d/e7983bdf-afd9-47d9-89f1-aaf248621fb9
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Nice! 
Welcome to the purple forum, enjoy. 