Are The Upanishads Different From The Religious Ideas In The Rig Veda?

INTRODUCTION
Are the religious ideas of the Upanishads different from the religious ideas in the Rig Veda?
Upanishads and rig Veda both have different religious ideas. Rig Veda consists of 1028 hymns dedicated to Indra, Agni, and Soma on the other hand Upanishads contains the philosophical concepts and ideas of Hinduism. (Upanishads)
Vedas are the scriptures of Hinduism and it is divided into 4 parts. Rigveda, Samaveda, Yajurveda, Atharvaveda, and Upanishads are also considered as a part of Veda as the end of the Veda.

EVIDENCE FOR UPANISHADS
Upanishads are known as Vedanta, which means “end of the Vedas”. Upanishads are regarded as the part of the Vedas and as part of the Hindu scriptures. It is more dedicated towards spiritual thoughts of Hinduism. Upanishads are composed over centuries up to about 1400CE. It speculates about the
The Rig Veda contains 1028 hymns, of which more than 800 appear to be simple and 220 are composite and consist of some 780 parts. These hymns are dedicated to the Rigvedic deities. The Rigveda was composed between 1450-1350 BCE. It divided into parts, two- third hymns of the Rigveda are related to the gods Agni and Indra and the rest is about Rudra, Ashvins, Savitar, and Surya. These are references to the Soma; whose juice was an energizer. Rigveda contains a sense of connection between Nature and the Rishis (Visionaries). These hymns are in the praise of deities and asking for their help in battles and wealth as well as for good life. The Rig Veda also contains the Indian system of castes. The God Vishnu played a minor role in the Rigveda but later he became one of the most important God in Hinduism. It also explains the birth and death cycle in some hymns and in some hymns, it tells us about the after death and heaven. It composed is such a way that is consistently given riddles and questions and hearer needs to resolve to understand the meaning of the