It would be risky since they are pretty similar. Can work behind a strong line, could get exposed behind a weak one would be my guess. Wouldn't hurt to try.
I guess I'd try this:
POJ-Letang
Pettersson-Petry
Dumoulin -Smith
Maybe flipping POJ and Pettersson has better results with more time though. But if I were trying to go deep I'd add someone.
- Tojo.
I've only watched 9 games of Smith, and hundreds of Letang, but I dont find Smith and Letang's game all that similar. They are both offensively competent, Tanger more so, but Smith is much more reserved with his choices and chance taking than Tanger. Tanger is also more physical. Might night work out or it could be solid. Smith was showing signs of being one of the, if not, Pens' best defenders so far this season. We would need a lot more reps/games to see for sure, obviously, but thats why I said I'd like to see it tried haha