The 0.6ohm coil of Breeze 2 is exactly the same as 0.6ohm of Breeze 1st generation, so no problem with interchangeability.

For 1.0ohm coil of Breeze 2, it’s interchangeable with 1.2ohm coil of Breeze 1st generation because they have same structure, however, to ensure a good vaping performance, we don’t suggest interchanging.