Lord shiva and adinath are same?

Short answer: No.

In Jainism, Adinath (Rishabhdev, Bhagwan R̥ṣabhanāth) is the first Tirthankara. A Tirthankara is an enlightened being who shows the path to liberation; not a creator or destroyer.

“Lord Shiva” is a Hindu deity associated with creation–dissolution in the Hindu tradition. That concept does not exist in Jain Dharma, which teaches a beginningless–endless universe governed by natural laws, without a creator god.

Why people confuse them:

• The title “Ādināth” (“the first Lord”) is also used in some non‑Jain traditions for Shiva, but in Jain usage it refers only to Rishabhdev.
• Both are shown with matted hair and a seated posture, and the bull appears in both traditions (Adinath’s emblem is the bull; Shiva’s vehicle is Nandi). The symbols look similar, but the identities and doctrines are different.

Both Śvetāmbara and Digambara traditions agree: Adinath is the first Tirthankara of Jainism, distinct from the Hindu god Shiva.