I think rose CO2 is closer to the otto, in terms of olfactory profile than to rose absolute. The CO2 is physically different, being a solid wax in most cases, but once applied the scent is a softer take on the otto experience; nothing compared to the rich and heady absolute. You can wear ottos and CO2s neat on the skin (only bear in mind they're considered carcinogenic, so dilute prior to applying), whereas absolutes need to be blended with other aromatics in order to be enjoyed properly.