As far as I know the Steppe tumuli of Ljeskova Glavica (A) (actually part of Cetina), Piskove (B ), Laukada (D) are supposed to be related in terms of their features.
We can add the Steppe Pazhok tumulii from Albania whose decorational motifs have closest parallels in Jigodin Schneckenberg.
This Corded Ware may not have anything to do with the CWC proper. As similar Ware was found earlier in Ezero horizon, and even earlier. Some have argued Steppe origin, others origin in some local traditions (Baden etc.). Although they may end up being related to CWC.
Gimbutas considered both Glina III Schneckenberg and Leukada R-graves to belong to Kurgan Wave 2 (as opposed to her Yamnaya Wave 3), that is more related to Ezero and proto-Anatolians.
Some have considered this burial ritual with slab cist graves to be Maikop related (again Wave 2 for Gimbutas).
Examples of this Corded Ware from Schneckenberg culture, Ariușd.
Newer paper on Yamnaya
https://www.academia.edu/2230109/Imm...ts_of_a_kurgan
Mala Gruda is a major Adriatic Ljubljana find.
If one is to go after this then Mala Gruda, Leukada Steppe people might descend of Apuseni mountain Yamnaya group. Again in terms of origin these are being connected to Schneckenberg (local base + Schenckenberg i.e. Schenckenberg is Yamnaya).