In Bhagavatī Sūtra, jala and snehakāya are related but not the same.

Very simply:

• Jala = ordinary water (gross water) – ponds, drops, rain etc.
• Snehakāya = a special, very subtle form of water – extremely fine moisture like mist, fog, humidity, dew‑like particles.

In the Bhagavatī Sūtra, snehakāya is clearly explained as:

• “jala kā ek prakār” – one type/form of water, not the whole of water.
• So, all snehakāya is jala, but not all jala is snehakāya.

From Jain viewpoint:

• Both come under ap‑kāyika pudgala / water‑related dravya, but

- jala = gross, visible water - snehakāya = ultra‑subtle moist particles pervading space, quickly destroyed, not staying long like collected water.

So, answer in one line:

No, “jala” and “snehakāya” are not exactly the same; snehakāya is only one very subtle variety of jala described in Bhagavatī Sūtra.