"I think it's a lot harder now to get to the places to score 100 goals," Klima told NHL.com by phone Monday. "It was a lot easier to score goals when I played in the '80s and '90s and Jagr in the '90s.
"I think he's going to be the next Jagr if he continues [like this]. There's obviously only one Jagr, but [Pastrnak is] playing well, he's very young, and he's got all his career in front of him."
Klima finished his 13-season NHL career with 313 goals, leaving after 1998-99. Jagr most recently played in the NHL last season with the Calgary Flames and scored 766 goals in 24 seasons; he is third behind Wayne Gretzky (894) and Gordie Howe (801).
"I wouldn't compare him to Jagr. Jagr was Jagr," said Bruins teammate and fellow Czech forward David Krejci, who played with Jagr in Boston during 2012-13. "But I think [Pastrnak], he's going to be known as David Pastrnak, one of the greats, especially from [the] Czech [Republic]. If you go down in the history book, you're going to see Jagr in the '90s, early 2000s, and then you're going to have Pastrnak.
"I wouldn't compare them, but I would put them in their own category and no one's getting close to them."
But Krejci, for one, didn't necessarily expect this.
Though they have been teammates for five seasons and have played together for the Czech Republic, Krejci said he didn't see this level of play, of goal-scoring, of stardom, coming for his countryman.
"To be honest, maybe not," Krejci said. "I knew he has lots of skill, but if you go [back] and look for his first or second year in the League, it's such a big jump. He always had the skills, but he works really hard in the summer and his shot has just improved so much. Now he has confidence and if you put all those tools together -- his confidence, his shot, his skills -- then it's hard to stop."
Pastrnak has a lot of work to do to approach Jagr's numbers. But the right wing, who has earned a spot on the Bruins' top line with Brad Marchand and Patrice Bergeron, has never shied away from hard work.
"A lot of work has been done, obviously it was four years, so a lot of work," Pastrnak said. "Experience has a lot to do with it as well, and confidence. Every year [I] try to get better.