1. Part Number Variance: The characters "K1" versus "1" following the base model "J102" likely indicate internal revision, production lot, or package marking differences. In the absence of explicit manufacturer documentation, such variations typically do not affect performance parameters and may only reflect product line subdivision or packaging adjustments. 2. Minor Price Differential: The price difference of only $0.01 falls within normal market fluctuation ranges and does not present a technical barrier to substitution. Recommendation: Prior to bulk replacement, it is advisable to confirm with the manufacturer whether any undocumented differences exist (such as minor internal structural adjustments or certification status) and to conduct sample testing to validate long-term reliability.