Those two different chips have different memory specifcations, ecc specifications, and are not related to PSoC 4 BLE development :)
Try reading these two documents and inferring the information you need:
I'm sorry nobody answered your first posting to the NAND forum.
>> 1 what’s the main difference between these two IC?
>> 2 Which ECC type ( 1bit ecc /528byte or 4bit /528 byte) should I apply on each ic ?
- The ML-1 family is 4x nm SLC NAND that requires 1 bit of ECC correction power per 528B.
- The ML-2 family is 3x nm SLC NAND that requires 4 bits of ECC correction power per 528B.
>> 3 Can I use 1bit ecc/ 528byte on s34ml02G200 ?
- No, the ML-2 family requires 4 bits of ECC correction power per 528B.
Let me know if you have more questions.
thanks for you!