Using AutoYast for image installation

I would like to clone from one PC to another one, based on openSUSE11.1, using AutoYast with image installation option.
The image is generated by Yast->Software->Installation into Directory.

I’m a little bit confuse between the ‘install’ as defined in the pxelinux.cfg/default :
label linux
kernel linux
append initrd=initrd ramdisk_size=65536
install=ftp://ip_addr/repository/openSUSE11.1/CD1
autoyast=ftp://ip_addr/repository/autoinstall/autoyast.xml

and the one that’s defined in autoyast.xml itself :
<image>
<script_location>http://ip_addr/repository/image/image.sh</script_location>
</image>

Do we still need that ‘install’ even if we’re using <image> ?

i think that autoyast is only used to make a copy of the configuration you used when installing for the first time.
So it won’t work if both machines are differents