So, is 1 2/3 the same as 1 3/4? No, absolutely not. They are as alike as a golden retriever and a cat. Both are pets. One will fetch your slippers, the other will judge your life choices.
In the grand scheme of things, the difference is small. But in the tiny, precise world of baking, building, or dosing laundry detergent, it’s a chasm. It’s the line between a masterpiece and a “well, that’s interesting.”
Next time you see them, give them a little respectful squint. You now know the score. And if you make the mistake anyway? Just call it a “rustic” or “artisanal” variation. That always works. Or just eat the evidence. I won’t tell.