From what i have seen Green ghost will not match up with orange or any other ghosts and so on for all others.
So if you breed an OG to a Green ghost you will get DB Hets and so on with the different colors of ghosts. so try to get ones that are of the same color line because there is a really good chance they may not match up. I am not certain if similar colored ghost traits are able to be combined or not, i just know that the green is not compatible with the others for making visual ghosts.
Obviously they are recessive traits.
and the as stated it seems orange ghost is the most common.