Variation in Orzel glazes

I was told that, as similar as they appear, the glazes on my sugar and coffee canisters are different.
That difference became even more apparent when I picked up a new mug from the cheap bin at Hospice. All the mugs from my coffee set do match.
The new one is the only odd one.
Although the colours are pretty accurately represented here, and very much alike,
I will refer to them as red and orange to highlight the distinction.

red:orange:red:orange (sorry, lost the colour of the right canister in the shadow)

red:red:orange:orange

I don't know the composition of glazes. Can anyone help?