No they are not because we talk here about ancestry and admixture. The drift is also causing the pseudo-EHG we see in so many Global25 models which neither fits uniparentals and historical evidence (EHG was already replaced by Fatyanovo and Finno-Ugrians, Balto-Slavs had only contact with Baltic HGs). Genetic drift among Slavs is higher and quite extreme because Balto-Slavs compared to West Europeans IEs were for the most time a much smaller population which quite recently exploded in numbers but this is not making some real genetic change or means it is all coming from new admixture. Global25 like Gedmatch calcs include modern drift to model modern admixture but these decreases the accurary of the models for ancient pops that is why many prefer QpAdm and formal methods for ancient pops which are less effected by drift. Fatyanovo-Sintashta predates both West Euro and East Euro drift so there is really no logic in saying they were much much closer to Scandinavians. The genetic differences between Scandinavians and Balto-Slavs without exotic admixture are mainly caused by drift which only started to form during the Bronze Age. Without drift Ukrainians cluster with Swedes. Also if anything East Europeans have an exiting Fatyanovo substrate even if mainly around 5-10% Scandinavians have none of it.
Here are Qpadm results from Davidski showing that steppe affinity is very similar among East and West Euro
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