I will list a couple of differences. If you would like sources and examples please ask. Salafi's reject the idea of Mazhab and claim to follow Quran and Sunnah directly. This contraditcts the very foundation of having a Hanbali (or the other 3) Mazhab. Hanbali's like the other school of Fiqh accept Ijma' as a source of Jurisprudice (after Quran Islam portal. v. t. e. Starting in the mid- 1970s and 1980s (and appearing to diminish after 2017), [1] Salafism and Wahhabism [2] — along with other Sunni interpretations of Islam favored by the Kingdom of Saudi Arabia [3] [4] [5] and other Gulf monarchies — achieved [a] a "preeminent position of strength in the global expression of Islam." Major figures in the definition of the salafi perspective and approach are Ahmad ibn Hanbal (d. 855), the founder of the Hanbali school, and Ahmad ibn Taymiyya (1263-1328). The fundamental concern of modern Salafiyya, who recognize that Muslim power and influence is in decline relative to the West, is the relationship between Islam and modernity. Atharism or Atharī theology (Arabic: الأثرية: al-atharīyah / al-aṯariyyah [æl ʔæθæˈrɪj.jæ]), otherwise referred to as Traditionalist theology or Scripturalist theology, is one of the main Sunni schools of Islamic theology which is more strict in adherence to the Quran and Sunnah. It emerged as a school of theology in the late 8th century CE from the scholarly circles of Ahl Answer. (Fatwa: 1106/951=B/1429) The present-day Salafis are deviated from the Right Path, in several issues they are against the mainstream Muslim Ummah. It is useful to study the book of Hazrat Maulana Amin Safdar Sahib: Mutala-e-Ghair Muqallidiyat. Allah (Subhana Wa Ta'ala) knows Best. A salafi is someone who follows the methodology of the righteous salaf, as was Shaykh ibn 'Abdul Wahhaab. A wahhabi is a derogatory term people use to identify people who follow the methodology of this shaykh, who was upon the methodology of the salaf, so those who follow him are actually following the salaf. Ibn Taymiyya (January 22, 1263 - September 26, 1328; Arabic: ابن تيمية), birth name Taqī ad-Dīn ʾAḥmad ibn ʿAbd al-Ḥalīm ibn ʿAbd al-Salām al-Numayrī al-Ḥarrānī (Arabic: تقي الدين أحمد بن عبد الحليم بن عبد السلام النميري الحراني) was a Sunni Muslim ʿālim, muhaddith, judge, proto-Salafist theologian, ascetic, and mifdGb.

difference between hanbali and salafi