The only difference between the Pacifics and Mikados was the locomotive chassis, the boiler and tender are identical.
Smokebox fronts on past models had either a high or centered headlight, depending on road. What remains to be seen is if that option continues.
Same for the Elesco feedwater heater.
That said, both are good candidates for repeated releases. While only 5 railroads had USRA or copy Light Pacifics, they present a good stand-in for other railroads. If I recall correctly, over 50 railroads had the the Light Mike or copies. Fertile ground.