1. Sensitivity Difference: The GP2Y1030AU0F has a sensitivity of 1.0 V/(0.1 mg/m³), while the GP2Y1026AU0F is rated at 0.35 V/(0.1 mg/m³). At the same dust concentration, the output voltage swing of the 1030 is approximately 2.86 times that of the 1026. A direct substitution would result in a significantly reduced signal amplitude. The existing signal conditioning circuit's gain or ADC input range may no longer be appropriate, necessitating recalibration or adjustment of the amplification factor. 2. Current Requirement Difference: The GP2Y1030AU0F has a maximum forward current of 35 mA, which is higher than the 20 mA of the 1026. This indicates higher internal IR LED drive or circuit power consumption in the 1030. If the original power supply or drive circuit was designed for 35 mA, switching to the 1026 presents no power delivery issues. However, if the system was designed for 20 mA, reverse compatibility is not guaranteed, potentially affecting LED intensity and detection stability. In summary, any substitution attempt must carefully evaluate signal chain compatibility and system power consumption suitability.