1. "T" vs. "L" in the Part Number: This distinction indicates a difference in the optical design or light transmission characteristics of the actuator (joystick), which constitutes the primary engineering variance between the two components. While the illumination voltage and color are identical, there may be differences in the internal light path, diffusion method, or final light output effect (e.g., brightness uniformity, viewing angle, pattern). This represents a non-functional change to the optical interface. It does not affect electrical connectivity or mechanical mounting but could influence the overall visual appearance of the panel and user perception. 2. Negligible Superficial Differences: Apart from the part number suffix, all specified electrical parameters (current, voltage), mechanical parameters (dimensions, thread, solder lug), lifetime, and environmental specifications are identical. Therefore, the components are directly interchangeable in terms of circuit functionality, installation compatibility, and reliability.