Basically I re-used a large portion of the code from Highway Wars. At the time I wrote New Heaven Cop I was having a bit of a crisis with Highway Wars. I was not sure where the story was going, could not seem to move forward much (it was started much before Tokyo Wizard, but only recently got published!). That said, Highway Wars was finished, though my first WIP is still not finished (The Nebula, for any that may remember, before Dropbox went down for us…)
So, I decided to re-use part of the structure to make New Heaven Cop. I changed and re-wrote large sections (both dystopian futures, but one is more Mad Max and the other more Blade Runner/Robocop), and then Highway Wars also changed substantially. But, for those with a sharp eye the similarities in that section of the game are really big!
I am now thinking about whether to re-use the central theme of my other story (which in itself draw inspiration from a choose your own adventure I read as a kid, and which I still have) in future work (actually it is a strong thought I have at present, to possibly overcome some of the possible structural problems of one of my WIPs…)