I currently have a non-functioning coffee machine and a broken kitchen scale right beside me. (Like, literally broken, I keep finding acrylic glass fragments...)
What if you're currently using a working coffee machine that's the same model of the broken one, keeping it 'just in case' the other one breaks 'in a different way' and you now have the part? Umm, asking for a friend...
I tried that once. Turns out they made some small changes between the different version of the same model and the parts didn't quite fit. I don't keep things around for spare parts anymore.