We do not know. We do not know what documents Trump had in Mar-a-lago, who had access to them, and what he shared with others. Furthermore, we do not know what was in Clintons emails and who read them. If anything, Hegseth’s is less damming, since we know the content of chat and participants. In both Clintons and Trump cases, the impact could be much bigger. The problem in all cases is lack of accountability.
However, Hegseth’s transgression was the worst in terms of severity by orders of magnitude. Details of an in-progress military operation and all.