Answer

Yes, in most Jain traditions, if you are doing both in one worship session, you begin with Mulnayakji and then do Navpadji puja.

Explanation

• Mulnayakji is the principal idol in the temple, so it is usually worshipped first.
• Navpadji puja is a separate and very sacred worship connected with deep spiritual contemplation.
• So the common respectful sequence is:

1. Darshan 2. Puja of Mulnayakji 3. Navpadji puja

However, if your sampraday, temple tradition, or guru has a specific vidhi, that should be followed.

Spiritual Understanding

Starting with Mulnayakji shows reverence to the main Tirthankar Bhagwan of the temple. Then Navpadji puja helps the devotee move from बाह्य worship to deeper inner remembrance of the path of liberation.

Takeaway

Generally, yes: first Mulnayakji, then Navpadji. If a local Jain vidhi is being followed, it should take priority.