Both of these varieties were grown in the same place: Izmir (previously know as Smyrna). Izmir Ozbas literally means "parental Izmir." Smyrna #9 is a numbered varietal derived from some form of Izmir.
Having grown them side-by-side, I can attest that they are similar, but quite distinct plants that are easy to distinguish from one another (if you know what to look for).
Bob
I agree with the opininon that they can be distinguished from one another but I'm sure that it's not easy if you don't grow them side by side. But it's nearly impossible to distinguish them by smoking, they taste really very similar, almost same (when grown in same conditions).
I want to add some basic linguistic information about the name of the city, Smyrna or İzmir. Actually the name of Smyrna didn't changed totally, it was just evolve into Turkish language. In Turkish it's impossible to read the words that have two consonant letters in a single syllable (because of the phonetic structure of the Turkish language). So people add a vowel before the word (it's common for foreign words - like stop and i-stop), so Smyrna become İsmirna, İsmir and finally İzmir.
Özbaş means " pure strain/race " as a word but the name of the İzmir Özbaş comes from the scientist Osman Özbaş who was an Agricultural Engineer (MSc.) and was the laboratory chief of an agricultural institute in Samsun (city). He bred strains that resistant to Blue Mold like İzmir Özbaş, Trakya Özbaş, Düzce Özbaş etc. There's very limited information about the researches he made because that time all tobacco related researches was carried in TEKEL Institutes by government so they were secret. Althought TEKEL sold to BAT, documents are still at the cosmic room and not released yet.
For the Cyprian Latakia, I wrote an quite short posts in different sections of the forum. Karpaz Peninsula (located at the North Cyprus) was the growing and also processing region of Cyprian Latakia (as I know there's no Latakia production at the South but I may be wrong). So the site
www.tobaccoseed.co.uk was providing (not available now) a variety called " Yayla Karpaz " from the Karpaz region
www.tobaccoseed.co.uk/Yayla_Karpaz1.html . If somebody you know purchased it when it was available, it worths to give it a try to see if it resembles İzmir varieties.