I'm not sure how much is in the Nordic ice. The difference between the general and camel could be ph balance which I believe will affect the uptake of the nic. I tried the camel when I first started and it was sweet like candy.
I Goggled it - Says 7mg nic, so not much difference. Seems like the round tins are best bang for the buck since you get 24 vs 15 in Nordic Ice.