The potential for such one-to-many matches is smaller for closely related languages, since they usually have the same set of morphological categories.
differences in the suppletivism of forms are common even across related languages, for example, the feminine adjectival forms ending with 2 https://github.com/ssharoff/cognates ой in Russian (e.g., новой, 'new') are used for any nonnominative case, while unique cognate forms are used in Ukrainian for each grammatical case, e.g., genitive: нової, dative: новiй, instrumental: новою, etc.