@george1421 I think we can mark this as solved. This conditional test works very well. I ended up using the MAC address for this and then creating a separate menu for each iso.
Example: In fog.local parameters
iseq ${net0/mac} f4:4d:30:65:23:94 && goto fog.Ubuntu-16 ||
iseq ${net0/mac} 00:30:1b:82:d2:d2 && goto fog.Gparted ||

Thanks,
Scott