Yes and No. They have the same general idea that the proper form of government is a theocracy where the civil laws of the land are derived from the Islamic Shari'a or Religious Law. The difference is that Islamism is usually national, so, for example, the Taliban only have aspirations to rule Afghanistan and the Waziristan region of Pakistan. They are not interested in some international coalition of Islamists. Pan-Islamists believe that the world should be united under one Islamist theocratic government.

Pan-Islamism holds that the proper form of government is a theocracy where the civil laws of the land are derived from the Islamic Shari'a or Religious Law. They are interested in an supranational coalition of Islamists. Pan-Islamists believe that the world should be united under one Islamist theocratic government. Some have pressed further saying that this one Islamist government should be lead by a Caliph.

Pan-Islamism is usually violent and expansive. Pan-Islamist terrorist organizations, like Al-Qaeda, have as a central tenet the idea that all countries across the world should submit to Islamist rule and embrace the Islamic worldview. Pan-Islamists fundamentally reject the idea of separation of church and state and fundamentally reject the idea of equality between people of different religious faiths.

From a historical perspective Hinduism preceded both Islam and Islamism.

religious differences

Traditional for Arabs expansionist policy supported by the new wave of Pan-Islamism.

Islam had a golden age. Islamism has never had a golden age.