It was about time to write about this issue after 2 months in Greece and 4th visit to the country. Well, first some information about the situation for the people who do not know it. My opinion is at the end of the page. Do not go before read it because I explain why these two type of coffee has given different taste to me.
In Turkey, Turkish coffee was known simply as kahve (‘coffee’ < Arabic قهوة, qahwa) until instant coffee was brought in during the 1980s. Today younger generations refer to it as Türk kahvesi (Turkish coffee). But before young generation does that in Turkey, Outside of Turkey, it is often called "Turkish coffee" in the local language:kafe turke (Albanian), τουρκικός καφές (Greek), turska kava/kafa/kahva (Serbian/Croatian/Bosnian), турско кафе (both in Bulgarian and Macedonian), cafea turceasca (Romanian) and кофе по-турецки (Russian), but also under the various national names, which are used to avoid the political and cultural implications of mentioning the former imperial power, the Ottoman Empire, and the current Turkish state. It is also called "Armenian Coffee" (Հայկական սուրճ haykakan surj), "Greek coffee" (ελληνικός καφές ellinkós kafés), and "Cypriot coffee" (κυπριακός καφές kypriakós kafés), in Armenia, Greece, and Cyprus, respectively.
Yes, as it is said in WikiPedia, in Greece at places where you get service and most of the houses the Turkish Coffee left its name to Greek Coffeee.
To make comments about such change would be a shame for a guest. But I would like to write about the physical and chemical change of the coffee after the name update.
Turkish coffee is made of dark black baked beans. The brand name I use is ‘Mehmet Efendi’. When I came to Greece I searched in the supermarket and found the brand name ‘λουμιδησ/loumidis’.
I was not expecting a different taste but it was not like that. Greek coffee is little bit different than Turkish coffee now and I do not see a connection.
This does not mean it does not taste good at all. Still after a dinner at a tavern I ask for Greek coffee. The taste is different and it is fair to call it Greek coffee now. The soft texture of the Greek coffee gives different taste.
As conclusion I can say that, if we need something to explain the situation, if the Turkish coffee is a Dark Chololate the Greek coffee is Milk Chokolate.
It can be seen that, as it was mentioned at WikiPedia, after changing the name of the coffee, the time changed its taste too.