Is 105.003 lume different than other 105 and 145 models?

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I have been spending a lot of time over the past looking at sale examples of 105.003 Omegas.
What I have found almost universally is that the index lume is darker (or more green, or worn off) condition versus other vintage 105s or vintage 145s. And often, the chrono seconds lume is in very poor shape (almost seems bordering on orange/reddish at times).

I might expect this when the ages of the watches vary, but I have seen this even when they are quite close in age.
I feel like I have seen enough to account for different 105.003 in regions of the world (so different care and humidity, etc.), so I was curious why this seems to be the case.
Is it simply that there was different lume used on the 105.003s? Or have I just by chance seen a stretch of 105.003s that aren't in as good condition (not that I expect them to be perfect by any means - they are after old, very old!)
 
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Often wondered this myself. They seem to range from almost green


to dark yellow.