A:Answer Hi! Thanks for asking. Models JKS5000SNSS and JTS5000SNSS are very similar in features except that model JKS5000 has True European Convection. This is a 6-pass broil element in the top of the oven and a 6 or 8-pass bake element in the bottom of the oven are used in conjunction with a third heating element. This third element is a 2500-watt, double-loop element located in the back wall of the oven, and it surrounds the convection fan. The convection fan reverse direction to allow air to better circulate around the food. Performance testing has shown that reversing the fan produces more evenly browned baked goods, which eliminates the need for turning food or rotating pans. - Model JT5500 has 5.0 cu. ft. capacity in the upper and lower ovens whereas JK5500 only has 4.3 cu. ft. in both ovens. - The Café model, CTD90FP2NS1, has a no pre-heat air fry mode as well as both Self and Steam cleaning features. - To find out a more specific time when a model was manufactured, we'd also need the serial number. Without it, we can provide a more general span of time. Model CTD90FP2NS1 began being manufactured, from what we can tell, in 2019 and is still currently being manufactured. This Café model wall oven will work without needing to use the SmartHQ app. This application is there simply for your convenience should you want to use it. Hope this helps! Best wishes. -Michael@Cafe
