I think there but in the same boat, dominate the euro league and they might stay there or production might not translate in the NHL, the size doesn't make them great candidate to play on the bottom 6. Mtl could included them in a package to acquire player at the deadline... I think Reway will see some action in the NHL at some point but there probably only a 50% chance that it is with Mtl. Lehkonen is probably more 50/50 to see time in the NHL.
Reway is a top 6 player maybe even 1st line, I think he have more impact than Ghetto and Carr today. But he already make more money than he would playing in the NHL + is attitude/work ethic he might be up to Mtl expectation... Fact he left the Q for the Czech, than the Swiss A league and that he wasn't at trainning camp kind lift a red flag. He has a higher celling than Lehkonen but the boom or bust factor might be higher.
Lehkonen doesn't have the same ability to dominate offensively, but he does have good offensive upside. He could play on a 3rd line but because of is size I think if he isn't able to crack the top 6 he become a interchangeble player.