AH Challenge: South Slavic dialect continuum in a surviving Byzantine Empire

Here is the map where it shows the distribution of South Slavic dialects before the 16th century migrations due to the intrusion from the Ottoman Empire (and the wars that followed):
566px-Serbo_croatian_dialects_historical_distribution.png

Here is the question: Will this distribution remain the same if the Byzantine Empire has survived (well, at least until the 19th century)? Will it affect the development of the Croatian language (and Serbian language,too)?

I asked this because I saw a map of Europe in a Byzantine-centred TL were the Byzantine Empire shared a border with the Serbian Kingdom in the world and the OTL present-day territory were under Hungary.
 
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abc123

Banned
Well, with butterflies so big- who the hell knows? We need more informations about that Byzantium? Borders, circumstances etc.
 

abc123

Banned
I must confess that I haven't really following niether of two timelines, but IMO there would be no major changes of dialects on the map.
 
I think when talking about dialects we shouldn't talk about a Serbo-Croatian language since both are artificial things derived from two neighbouring speaches of a single dialect spoken by the people in these parts. The correct term would be South Slavic dialect continuum.
 
Answer - to best of my knowledge - unless Thrace and Greece get a major population surplus I don't see much happening in ways of Greek colonization of the areas. Historically even Byzantine vassal states kept their own language.

So the chances of "A" South Slavic Dialect Continuum surviving are good. Whether it will look similar to your map, hard to say, I don't know enough about the area.
 
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