"Circle of Life" and "Can You Feel the Love Tonight" only have different lyrics in their "pop versions" (sung by Elton John in the original soundtrack). According to the makers of The Lion King, more than a dozen set of lyrics were written for "Can You Feel the Love Tonight" before they settled down to the final version, so I guess they used some of that in the pop version.

In addition, the songs were altered a little for the Broadway production, were they've changed the last verse of "Can You Feel the Love Tonight" (but I'm pretty sure that the lyrics of "Circle of Life" are the same in the Broadway show).

In general, when a movie is turned into a Broadway show, sometimes a few lyrics are changed, cut or added to fit the needs of the new production. Personally, I find it wonderful when they get to add some lyrics that were originally cut from the movies (such as in Fathoms Below or Gaston Reprise); and I can always find the original versions of the songs in the films' original soundtracks.

I hope I helped you, feel free to ask if I didn't explain something very clearly!

Thanks! That does help explain. I assume the newer pop versions or Broadway versions are the more popular ones now, because I see those lyrics a lot more than the originals on youtube, twitter or places like that.