Audio Swap of same movie but movies not same length

Hi,
I hope someone can assist me with this issue. I've tried several methods of trying to synch the audio of one movie (English but contains hard-coded greek subtitles and a length of 1:49) with the video of the same movie (audio in Spanish, movie length of 1:45). I've tried modifying the bit rate of the audio using every option of FFMPEGGUI along with DVDLAB Pro without success. I think this may be impossible but I hope someone with more authoring experience can help out. Thanks!

 

Is the movie that is 1:45 25 frames per second,
while the longer version is 23.976?

If so, they may have the exact same content and all you need to
do is a time stretch (or shrink) operation on the audio
to make it fit...

 

The longer movie's (Greek) framerate is 23.976 while the shorter's (Spanish) is 25.000. Thanks for replying!