As a whole they are pretty distinct but I see some fragments of their games that overlap from what I've seen from Boucher. In addition, I see some similar raw tools but those other players have found a better way to implement and utilize them. For Boucher to get more out of his tools I believe he will begin to emulate some of those players and the comparisons between them will become more apparent.
Fundamentally, I made that post to establish a clear criteria to evaluate Boucher against. Kreider, Landeskog, Miller, Wilson, Horvat, Tuch, Crouse, Norris and Tkachuk are all power forwards that were taken within the top 20 picks and have all become fairly successful. In my opinion they represent a tier of players where their production and overall impact to their team is relatively close, or at least close enough to be encompassed within a singular tier. Therefore is a power forward that was drafted within that same range, ends up being appropriately classified within that tier at the peak of their career, then to me it is an indication that they have justified the high draft selection.
An alternative way of looking at it, is to include a player within that tier and then determine whether they fit or stand out as an anomaly. For example, Zack Kassian and Nick Ritchie were also taken fairly high in their respective drafts but I don't believe that they have demonstrated that the fit in that other tier of players. It becomes a way of establishing a clear and reasonable criteria for making such evaluations on whether a player was worthy of their draft selection.
If at the peak of his career Boucher has similar production and a similar impact to this team as that of Kreider, Landeskog, Miller, Wilson, Horvat, Tuch, Crouse, Norris and Tkachuk, it is my belief that that demonstrates the high pick was justified. If his production and impact are meaningfully less then I believe there is merit behind scrutinizing the pick.
Many of those players were similarly doubted early on; there was criticism of them being selected that high and in some cases people claimed they were bad picks. In many cases those players took multiple seasons to reach their peak potential and the criticisms continued until that point. If Boucher ends up justifying his draft selection he will likely follow a similar development path to those other players and take some substantial leaps in development later on.