Answer

From a Jain point of view, you can respect both traditions, but you should not confuse them as the same path.

• Lord Mahavira is a Tirthankara in Jain Dharma.
• Shivshankar belongs to a different religious tradition.
• In Jainism, the main devotion is to the Navkar Mantra, and to the Arihants, Siddhas, Acharyas, Upadhyayas, and Sadhus.

So:

• Respecting both: yes, that is possible.
• Treating both as equally part of Jain worship: no, that is not traditional Jain teaching.
• Chanting Shiva mantras: it is not part of Jain practice.

Explanation

Jain Dharma teaches right faith and clear understanding.

A Jain may:

• respect all noble and spiritual beings,
• appreciate good qualities in any tradition,
• live with tolerance and reverence.

But in actual Jain sadhana, one should stay rooted in:

• Navkar Mantra
• Jain prayers and stotras
• teachings of the Tirthankaras

If a person chants other mantras out of habit or family custom, that is a personal matter. But spiritually, a Jain should remember that the Jain path is complete in itself and should not mix beliefs in a way that weakens Jain faith.

Spiritual Understanding

Jainism teaches anekantavada and respect for all, but also clarity in one’s own dharma.

That means:

• do not hate other traditions,
• do not insult other deities,
• but keep your own devotion steady and pure.

For a Jain, true inner refuge is in:

• Arihant
• Siddha
• Jin-vani
• right conduct

Takeaway

You may respect both, but in Jain Dharma, your main worship and chanting should remain with Jain mantras and Jain ideals. That is the most proper and spiritually clear approach.