There are two things to really keep in mind here.
1. The Rangers drafted two kids who are already playing against men in their respective countries. Clearly that experience is something the Rangers gave at least some value and consideration to in their evaluations.
2. This is one of those drafts where lists are going to be all over the map. I think if you were to look at different teams' lists, you'd probably see more variety than usual. I've generally found that the term "weaker draft class" is code for "we have to do our research because there's no clear consensus."
Andersson projects as a versatile center that can also play wing. Some of the names mentioned are pretty good comparisons. If there's one area he lacks, it might be be that top level offense. But that also shouldn't be interpreted as meaning that he is no offensive ability or upside. It just means that you probably shouldn't project him as your top one or two offensive weapons.
Chytil is a bit more of a wildcard. He's grown significantly over the last 12 months, both in his game and physically. With that, he is much more of a work in progress --- but as mentioned several times, he is also a younger prospect. I'd be curious to see if the Rangers view him as a center or wing, because I'm not sure that path is clear yet.