There is no command within clonezilla to do it
but
if you look inside the clonezilla savedisc directory you can see that each partition is a separate image file. So, in theory, you could take the image of one partition, feed it to clonezille somehow?, and restore it.
I have never tried it.
Maybe you would like to try writing a shell script to do it… It would be a useful thing to have.
Only thing is, it needs to be rock solid reliable.
Take up the challenge
Neville