To explain how I would do this:
1. Download the dynasty calculator linked above.
LINK.
2. Answer the easy questions to get your league's dynasty factor, or DF.
3. Plug in the best guess as to what the pick will be (say pick 10) in the calculator. You'll get a modified pick value (that is Dynasty Pick 10 won't equal a Redraft Pick 10 - it will be much lower value).
4. Use Dodds' calculator to figure out what pick in a redraft league that equals out to be. Use that answer to gauge the player in question's value (the vet). I'd compare his ADP to that pick value.
You can also do either method first (Step 4 ahead of Steps 1-3).
For example, let's say you are looking at Deuce McAllister vs. a First or second round pick next year.
Deuce's ADP was about 6.07, or 67. Plugging that in the the Redraft Calculator gives a value of 428.
For an average Dynasty League with a DF around 3.5 (the default is roughly that), Pick 14 overall in a rookie draft is 433 points.
That's about your answer.