Synchronize music of different length

[Urs Liska]

Hi all,

what would be an elegant way to synchronize a passage of music that is 
of different length in two staves?

I need to make an example where the composer made a second version that 
compressed two bars into one. At the same time he modified the melody 
around common anchor notes
I would like to typeset these measures in two staves so that the 
corresponding notes are aligned, ignoring the metric situation.

One would be:
(\time 4/4)

\relative e'' {
    e2. e4 | g2. cis,4 |
}

The other one:

\relative e'' {
  e4~ e16[ fis] e[ fis g4. cis,8 |
}

Thanks
Urs