I doubt it as that seems really confusing! Sw has so much versatility that I can go weeks without eating the same thing twice so not sure why you would need to switch!
That's not a bad idea actually, it would keep things mixed up a bit and as long as you didn't spend less than 7 days on each diet then I can't see why it wouldn't work.
It's something I might think of trying if I start struggling with SW or perhaps have a busy week with social events etc that may require more convenience food.
Having done SW and calorie counting (similar idea to WW despite what they might say about it not being based on calories, it is!), I found I ate the same type of things on both, just in smaller quantities on CC.
I'm sure if you were extremely organised it could work, I personally know I couldn't do it given that I still don't understand all 3 sw plans haha! Red is just beyond me!