1. Physical Interface and Mechanical Dimensions - The MMRD4016GVJBCA00ABA0 is a standard SDHC card, while the MURD4016GVHBCA00ABA0 is a microSD card. - The two are not directly interchangeable in the same card slot. If the original design uses a standard SD card slot, replacing it with a microSD card requires an additional mechanical adapter. This introduces risks of contact reliability (such as intermittent connections due to vibration) and may not comply with the original product's structural design specifications. 2. Different Series - They belong to the MMRD4 and MURD4 series, respectively. - Although core parameters (capacity, speed, pSLC technology) are consistent, different series may correspond to different internal controllers, firmware, or packaging processes. This could lead to subtle differences in performance under extreme conditions (e.g., sustained high-load read/write operations), power consumption characteristics, or long-term reliability, which must be confirmed through application validation. 3. Implied Application Differences - microSD cards are typically intended for space-constrained embedded devices (e.g., industrial control modules, portable equipment), while standard SD cards are more common in industrial-grade fixed or test equipment. - Direct substitution may not meet the original device's mechanical protection requirements (e.g., shock resistance, anti-ejection), necessitating a reevaluation of structural design compatibility. Recommendation: If substitution is necessary, the hardware interface compatibility (including electrical connections and mechanical structure) must be thoroughly reevaluated. Additionally, long-term read/write reliability testing in the target application should be conducted to verify whether the performance and lifespan of the MURD4 series are equivalent to those of the MMRD4 series under identical operating conditions.