Answer

The two passages are similar in theme, but they are not the same.

• First Shataka, 9th Uddeshaka: the question is about binding/acquiring ayushya-karma. It asks whether a living being can, in one instant, acquire the karma for two lifespans at once — this life and the next life. Bhagavān denies this and says that in one instant a soul acquires only one ayushya, either for this birth or for the next birth. ( jainqq.org)
• Fifth Shataka, 3rd Uddeshaka: the question is about experiencing/realizing lifespan. It says that life-spans connected with many births are interwoven like knots in a net, but a living being experiences only one lifespan at a time — either the lifespan of this birth or the lifespan of the next birth, never both together. ( jainqq.org)

Explanation

So the difference is mainly this:

1. 1st Shataka, 9th Uddeshaka = bondage of ayushya karma

- focus on when karma is bound - the point is that two ayushyas are not bound in the same instant ( jainqq.org)

1. 5th Shataka, 3rd Uddeshaka = experience of lifespan

- focus on how lifespan is experienced across births - the point is that present-life ayushya and next-life ayushya do not operate simultaneously ( jainqq.org)

Spiritual Understanding

In Jain Dharma, this teaches that the soul’s karmic process is orderly and exact. Ayushya is not a confused overlap of two lives; it is bound and experienced according to karmic sequence. That is why the Bhagavati Sutra rejects the idea of simultaneous dual lifespan. ( jainqq.org)

Takeaway

In short:

• 1st Shataka, 9th Uddeshaka = one instant, one ayushya-bound karma
• 5th Shataka, 3rd Uddeshaka = one time, one lifespan experienced

Both reject “two lifespans at once,” but they do so from two different angles: bondage and experience. ( jainqq.org)