[Zippideedooda]

I recently saw a one half straight that combines Policar track to Ninco track. This makes me wonder how similar Policar is to Ninco and if the curve radius would allow say a Policar outer curve with a Ninco inside curve so a 4 lane track could be made? 
 I currently have a lot of Ninco track, but would need more R4 curves to complete some larger layouts. Ninco R4 curves are quite scarce these days.