PCA9306: Is required to use i2c switch if we have on the same i2b line sensor who communicate at 3.3V and also at 1.8V?

Hi, developing our sensor we have only one i2c port left.

After the last changes we have an new sensor who is feed at 1.8V and we need to use the PCA 9306 to shift the level of communication.

The question is can we use only the PCA9306 to switch the level only for the sensor who communicate at 1.8V or do we need to add a i2c switch in order to have 2 separate busses one at 3.3V and another one at 1.8V?

Thanks !

Lucian