فَوَسْوَسَ ... قَالَ يَا آدَمُ
Satan whispered; the content of the whisper then followed.
زَعَمَ الْعَوَاذِلُ ... صَدَقُوا
The reproachers made a claim; the next clause answered whether that claim was accurate.
In the first, the second clause explains what the whisper consisted of: complete connection. In the second, sadaqu answers an implicit question about the prior claim: resembling complete connection.
Both omit wāw, but one provides content and the other responds to an unspoken inquiry.