It will be extremely difficult to match DV to 16mm when cut back to back. There are so many different qualities about the image that are very hard - nearly impossible to match completely to the trained eye. The main differences will be the handling of highlights, the definition of the image, the depth of field and the artifacts in the image (grain / noise etc).
The telecine can help you with matching colours - but thats only half the battle. Do whatever you can to make the depth of field similar as this can't be fixed later. Also, your miniDV images will be razor sharp compared to the organic softness that the film grain in 16mm will most likely provide (subject to which actual stock it is of course). You *may* want to experiment with adding a grain texture to your miniDV to help match, although be sparing with it. Most people add far to much grain and in the wrong places when they're trying to "match" video and film. The result is just noisy video!
Theres another thread under video that asks a similar question, which of course attracts all the "film is God" brigade (You know: never make a film unless you have 65mm etc etc)
So the quick answer is to the trained eye, its almost impossible. To your average audience, well - they should be looking at your characters not your grain.
Baraka Post Productionwww.baraka.co.uk