I happen to have one of each, and even though the cap on my surplus canteen is thicker, the neck is about the same dimensions and so are the threadings. I twisted the surplus canteen's cap on the Nalgene Oasis and it tightened and held securely. The cap on the Oasis canteen screwed onto the old canteen and also seemed to hold securely even though it didn't seem to screw down as far(I could actually still see some threadings on the old canteen peeking under the cap.
I'll test to see if they hold water or if they leak a bit later.
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