The appearance, specifically color of lens models may change to a degree when items are restocked and reprinted.
No LOT number can be the exact same as another.
It is just the nature of printing lenses.
Each production run, the steel plates that have the etched design gets used 100,000+ times.
All the friction and movement on the plate will cause it to wear down slowly but nonetheless gradually.
We can make many laser etched copies which are seemingly the same, but no two plates can ever be the exact same much like a fingerprint. This is because of the nature of steel and metals in general. One slab may look the same as another, but because metal is a composition of various minerals, the density will never be the same across the board, which means when a laser strikes the metal with the same strength setting, etching depth won't be the same because of the varying degree of hardness and density.
We are speaking in the realm of micrometers.
And this rings true for every colored contact lens in the industry. No two LOT numbers will be 100% identical. It is simply impossible.
We manufacture our own lenses, and we also laser etch plates. We try to get it as close as possible but there are limitations.