Is the Promised Paradise different from what the Prophet Adam (peace be upon him) saw, and what was the Paradise he saw, and what are the religious texts mentioned in this regard?

The Paradise in which Allah Almighty housed Adam and his wife is the Garden of Eternity. This is the saying of the predecessors of the Ummah (Muslim nation) and the People of the Sunnah and the Community (Ahl al-Sunnah wal-Jama'ah). Several matters indicate this, among them: Allah Almighty's saying: (وَقُلْنَا اهْبِطُوا بَعْضُكُمْ لِبَعْضٍ عَدُوٌّ وَلَكُمْ فِي الْأَرْضِ مُسْتَقَرٌّ وَمَتَاعٌ إِلَى حِينٍ) Al-Baqarah/ 36, which clarifies that they were not on Earth. It is also described with attributes that are only found in the Garden of Eternity, such as His saying: (إِنَّ لَكَ أَلَّا تَجُوعَ فِيهَا وَلَا تَعْرَى وَأَنَّكَ لَا تَظْمَأُ فِيهَا وَلَا تَضْحَى) Taha/ 118-119. And the Prophet, peace and blessings be upon him, said: "O our father, open Paradise for us." He will say: "And did anything expel you from Paradise except your father Adam's sin?" This indicates that it is the same Paradise from which he was expelled. Furthermore, the definite article "al-" (ال) is used with the word "Paradise" in all instances, which implies that it is the well-known Garden of Eternity.

As for the hadith: "I have prepared for My righteous servants what no eye has seen, no ear has heard, and no human heart has conceived," its meaning is that it contains blessings that no human has seen. This does not negate that angels might have seen some of it, or that Allah created things in it that no one has been privy to, or that the intent is the eyes, ears, and hearts of humans, or that this bliss is renewed for them in Paradise constantly.