Wait, what? Would you pronounce those two words with a different sound? I can't think of any Swedish dialect where that is true?
The whole point of this article is that sj-ljudet has a bunch of different realisations, some closer to the initial in "shell" and some closer to the initial in "whip".
Also Swedish, and disagree. GP is close(r).
Are you perhaps from Norrland? Then I see what you're saying.