I'm going to address this because I already know people will complain tomorrow if we exchange 12 points (there are rumours that the Greek jury won't give 12 to Cyprus because the song was originally submitted to represent Greece in 2023 and there is some drama, but obviously the tele vote will be 12 points each way).
Unlike Norway-Sweden for example, Greece-Cyprus have the same ethnicity (most people who live in Cyprus are ethnic Greeks aka Greek-Cypriots), language, culture, and music industry. Also, many Greeks from Greece have represented Cyprus in Eurovision, and many Greek-Cypriots have represented Greece. Let's look at Cyprus' recent history in Eurovision:
2024-Silia Kapsis, Australian born to a Greek-Cypriot father and Greek mother from Thessaloniki
2023-Andrew Lambrou, Australian born to a Greek-Cypriot father and Greek mother from Limnos
2022-Andromache, a singer from Greece
2021-Elena Tsagrinou, a singer from Greece who is very famous in Greece (and Cyprus)
2020-Sandro Nicolas, German born to a German-American father and Greek mother from Zakynthos
2019-Tamta, originally from Georgia but lived in Greece most of her life and is a huge star in Greece (and Cyprus)
2018-Eleni Foureira, originally from Albania but lived in Greece most of her life and is a huge star in Greece (and Cyprus)
And Greece had Greek-Cypriots representing us in 2015, 2012, 2011, 2007, 2006...
So it's very different than Sweden and Norway voting for each other. Most Cypriots are Greek and will vote for "mother Greece" naturally, especially with someone like Marina Satti who is very famous in the Greek-speaking world, and most Greeks will vote for our "little sister Cyprus" especially with a singer like Silia Kapsis who maybe isn't very famous in Greece but speaks Greek fluently and her mother is from Thessaloniki.
I could be wrong but I don't think Sweden and Norway have the same music industry as they are completely separate countries with a unique language and ethnic conscience. If you go to Cyprus (not including the illegally occupied northern part) you will see more Greek flags around than Cypriot flags. There is clearly a reason for that which I won't get into here.
I'm sure if for example Belgium sent a singer with a Polish parent who spoke fluent Polish that they would get high points from Poland, and I'm sure if Kosovo had more international recognition and participated in Eurovision then them and Albania would always swap 12 points.
And many countries who normally would give a song like Greece 2024 very high points are not competing this year, like Bulgaria and Romania.