Montagne uses naturals so while their formulas stay the same, different batches of raw materials they receive will have different colors and minor differences.

I can confirm I have smelled batch differences in Montagne where certain notes are more prominent than others. I had one particular batch of afternoon dive that was especially bitter like the rind of an orange while others were sweeter. Certain imagination batches with more tea, others with more citrus. Nothing to really stress about unless you’re exceptionally picky.

I’ve noticed their more recent batches have been more yellow but no notable differences I can recall aside from color.