The WS is low viscosity, and the usual reddish color when new, but quickly darkens even with 'normal' use.
You're saying the fluid you drained out was distinctly "orange"?
That's bizarre, and certainly not the original factory-fill WS with 200K miles on it.
Given that you've only partially diluted the entire volume of fluid that's circulating in the transmission, torque converter and cooler, I'd repeat the pan-dump-and-fill cycle at least 4 more times to get the majority of whatever was in there, out.
Just out of curiosity, what color is your engine coolant? Toyota red or pink, or something else?