i asked the same thing from Bitmain support and they reply this

 
Nick (BITMAIN)
Aug 16, 2022, 15:47 GMT+8
Dear Customer,
1.   Each S19 Hydro or T19 Hydro has 4 hashboards.
2.   The chip model of S19 Hydro or T19 Hydro is BM1398BB, there are 104 chips on each hashboard, and a mining machine has a total of 416 chips.
3.   There is no special difference between different water-cooled miners except for the model, hashrate, etc.
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