A supreme leader typically refers to the person among a number of leaders of a state, organization or other such group who has been given or is able to exercise the most – or complete – authority over it.
Paramount leader 維基百科解釋：In modern Chinese politics, the paramount leader of the Communist Party of China and the State is an informal term that refers to the most prominent political leader in thePeople"s Republic of China.
根據維基百科的解釋，好像兩個單詞的區別不大，Paramount leader 更具中國特色一點。
Supreme leader 維基百科解釋：
A supreme leader typically refers to the person among a number of leaders of a state, organization or other such group who has been given or is able to exercise the most – or complete – authority over it.
Paramount leader 維基百科解釋：In modern Chinese politics, the paramount leader of the Communist Party of China and the State is an informal term that refers to the most prominent political leader in thePeople"s Republic of China.兩個詞都可以理解為最高領導人
Paramount leader 維基百科裡有解釋類似於西方所說的president,但又有點不一樣。president在中國沒有實權，但是Paramount leader卻有，可以說成是“總書記”。
Supreme leader 是有實權，最高權力的領導人。
因為對policy方面的職位，等級不太熟悉，只能大概更具維基百科來分析，但不能確定具體的區別呢。慚愧~