1st riff: 
 
These are the chords (2nd gtr.): 
Eb B Ab Eb 
And these are the notes (1st gtr.): 
Eb Eb F Gb B Bb Ab Ab B Bb Gb Eb 
 
Play them like this: 
2nd gtr.: Eb             B      Ab                   Eb 
 1st gtr.: Eb Eb F Gb B Bb Ab Ab B Bb Gb Eb 
 
 
2nd riff: 
 
These are the chords (1st & 2nd gtr.): 
Eb Db Ab Db 
 
Play them like this: 
2nd gtr.: Eb                   Db                       Ab                     Db 
 1st gtr.: Eb Eb Eb Eb Eb Db Db Db Db Db Ab Ab Ab Ab Ab Db Db Db Db Db 
 
All you need to do is play one riff, then 
change to the other riff when the music does.