It's simple, Baltic in Myheritage and Baltic in Gedmatch K13, mean 2 different things.In My heritage, 'Baltic' is used in the same way ethnicities are used in Gedmatch, whereas in GedMatch it refers to a genetic cluster.The 2 reports of your results match perfectly if you look closely.
If you had higher Baltic and lower North atlantic(in a Ged match K13 breakdown), the Gedmatch Oracle would have said you are close to 100% ukrainian(than 50%) cause you match so well in almost all groups. But since your results dont match very well in those K13 main groups, the algorythm of the K13 Calculator (am guessing )reported similar ratio of populations matches as Myheritage , 60 to 40% or 50% and 50%.
Similarly, You have too high Baltic for a French(westnorth european by MyHeritage), thus the algorythm of MyHeritage reported you as half East European.Efectively the algorythm of MyHeritage is doing the same thing as the GedMatch is doing. My heritage uses genetic markers as identifiers, which they group in genetic groups like eurogenes is doing with the K13 groups(in this case) , and then the aglorythm tries to find which ethnicity match your results better. Since it is highly unlikely you ll get 100% match to a single of their reference populations, the algorythm tries to find the combination of the reference groups that best describes your results .
So the short answear to your question. 'Baltic' in MyHeritage is an ethnicity.
In GedMatch is a genetic group used as an identifier.
If we use grammar as a metaphor for Genetics, Baltic in My heritage would be a sentence, whereas in Gedmatch it's a word.
Look it for yourself
[TABLE="width: 0"]
[TR]
[TD="bgcolor: #4a86e8"][/TD]
[TD="bgcolor: #4a86e8, align: center"]West Asian[/TD]
[TD="bgcolor: #4a86e8, align: center"]East Med[/TD]
[TD="bgcolor: #4a86e8, align: center"]West Med[/TD]
[TD="bgcolor: #4a86e8, align: center"]South Asian[/TD]
[TD="bgcolor: #4a86e8, align: center"]Red Sea[/TD]
[TD="bgcolor: #4a86e8, align: center"]Baltic[/TD]
[TD="bgcolor: #4a86e8, align: center"]North Atlantic[/TD]
[TD="bgcolor: #4a86e8, align: center"]Siberian[/TD]
[TD="bgcolor: #4a86e8, align: center"]Amerindian[/TD]
[TD="bgcolor: #4a86e8, align: center"]East Asian[/TD]
[TD="bgcolor: #4a86e8, align: center"]Oceanian[/TD]
[TD="bgcolor: #4a86e8, align: center"]Northeast African[/TD]
[TD="bgcolor: #4a86e8, align: center"]Sub- Saharan[/TD]
[/TR]
[TR]
[TD="bgcolor: #4A86E8, align: center"]Ukrainian[/TD]
[TD="align: center"]6.12[/TD]
[TD="align: center"]5.68[/TD]
[TD="align: center"]12.05[/TD]
[TD="align: center"]1.09[/TD]
[TD="align: center"]0.16[/TD]
[TD="align: center"]43.57[/TD]
[TD="align: center"]27.77[/TD]
[TD="align: center"]1.41[/TD]
[TD="align: center"]0.78[/TD]
[TD="align: center"]0.91[/TD]
[TD="align: center"]0.28[/TD]
[TD="align: center"]0.11[/TD]
[TD="align: center"]0.07[/TD]
[/TR]
[TR]
[TD="bgcolor: #4A86E8, align: center"]You[/TD]
[TD="align: center"]6.47[/TD]
[TD="align: center"]6.69[/TD]
[TD="align: center"]13.12[/TD]
[TD="align: center"][/TD]
[TD="align: center"]1.02[/TD]
[TD="align: center"] 31.49[/TD]
[TD="align: center"]38.82[/TD]
[TD="align: center"] 0.68[/TD]
[TD="align: center"]1.53[/TD]
[TD="align: center"][/TD]
[TD="align: center"][/TD]
[TD="align: center"]0.18[/TD]
[TD="align: center"][/TD]
[/TR]
[TR]
[TD="bgcolor: #4A86E8, align: center"]French[/TD]
[TD="align: center"]4.96[/TD]
[TD="align: center"]10.33[/TD]
[TD="align: center"]19.50[/TD]
[TD="align: center"]1.08[/TD]
[TD="align: center"]2.82[/TD]
[TD="align: center"]17.49[/TD]
[TD="align: center"]42.60[/TD]
[TD="align: center"]0.27[/TD]
[TD="align: center"]0.38[/TD]
[TD="align: center"]0.15[/TD]
[TD="align: center"]0.23[/TD]
[TD="align: center"]0.07[/TD]
[TD="align: center"]0.12[/TD]
[/TR]
[/TABLE]