1. Dimensional Variance: The length of XLC-60-24-MA is 136.0mm, compared to 176.0mm for XLC-60-24-MAS, making the MA version approximately 40mm shorter. The MA part employs a more compact mechanical design, likely utilizing a higher-integration power topology or an optimized thermal layout. This enables a reduced form factor while maintaining the same 60W output and 87% efficiency, which is advantageous for saving internal board space. 2. Cost and Design Iteration: The smaller MA part carries a higher price point ($51.17 vs. $46.90). This typically indicates that the MA is a newer design iteration. The price premium likely reflects the use of updated technology, superior components, or enhanced thermal management to maintain performance across the full temperature range—all necessitated by the miniaturization effort—rather than representing a simple cost-reduction exercise. The MAS part is presumably an older or standard-sized version. Substitution Considerations: The MA part is a qualified replacement for the MAS provided the installation space is sufficient (MA requires less depth) and the cost difference is acceptable. If the existing mounting holes are designed for the MAS length, attention must be paid to the securing method when switching to the MA.