^ I have to be blunt, knokout. Considering RCT4 looks like every theme park app game on the market, they've already taken a huge step back.
Also, you have to consider this. No company creates a game, and then shells out the money to make a compleately different version of the game at the same time. When a company makes a game for various platforms, it's very similar and not something that can be considered compleately different.
If the PC version was truly compleately different, it would be totally seperate and have a different look, feel, gameplay, design etc. But with Atari going bankrupt last year and having the shelve plans to port the original games to mobile, there's just no way they'd shell out the money on "2 compleately different games".