Music in the Film (and elsewhere)

I recently watched "The Lost World" (1925) for a class I am in (about special effects) and being a movie score nut, I noticed that the music that is played during the initial "conference scene" (the scene in which Challenger first tells everyone what he encountered and the aspiring reporter Roxton sneaks in) is also played in the end credits of the movie "First Knight" (1995). The soundtrack listing for "The Lost World" credits Rudolf Friml for the music (and my professor said he believed the music was based on a Hungarian tune, so I guess this makes sense if he is indeed also responsible for this section of music). Does anyone know if this is a common tune well known in Hungary? (national anthem or something perhaps). I'm curious, because I'd like to know why Goldsmith is listed as the sole creator for the soundtrack for "First Knight" if the music originally appeared in "The Lost World." This is driving me nuts! Thanks.