Clone trooper variation?

Okay, I don't really follow all the Star Wars LEGO news, so maybe someone noticed this before. (I didn't spot any discussion after a quick Google search, though.)

I hate hate HATE the "Chrome Vader" promotion LEGO is doing. I spent a LOT of money on LEGO products. More than I should, really. And how does LEGO reward this loyalty? By making sure there's here's going to be a hole in my collection. All because:

1) I'm not lucky enough to pull a "randomly packed" figure at 300-1 odds

and

2) I'm unwilling to pay $70+ on the aftermarket for it

It pisses me off. I had resigned myself to having collection gaps when the Chrome 3PO came and went...but this is Vader. I like Vader. I covet the Chrome version.

So, like the addict I am, I've been buying some of the smaller battle packs in a vain hope to score one. I figure at the worst I can just put the parts into the Buy-Me-Mizer and eventually recoup a portion of my costs. Maybe.

Anyway, I was parting out a few sets last night when I noticed this:

See the variation? Although listed as the same part, these Clone Trooper faces are clearly looking in different directions.

It's probably due to variable alignment on the spray-op for the brown paint used for the iris, but the distribution of the faces was roughly equal for all three versions in the batch of heads I was looking at.

Weird, eh?