The shade of Dunkelgelb has been a debate for as long as I remember. The late T. Jentz is the advocate of the greenish tint and I tend to believe his judgement.

The newer (last 10 years) of colors tend to really lean to the green, much more that Tamiya's original. I'm not famiya with TS-3, I've switched to Vallejo about 8 years ago and haven't looked back, so I can't attest to it. Tamiya prides itself with accuracy, I would think they may change a formula if new evidence is found. You can find comparison charts for all the major suppliers.

As to differences in colors, there can always be a batch variation, theoretically even in the same batch, that's why it's usually best to mix two bottles together instead of shooting one after the other. Age, thinning, it all affects color, even lighting (Under flourescent lighting, Vallejo looks a sickly green yellow).