PS4 edition of -pure station- has additional content but the downloadable PC version that comes together with the PS4 edition is identical to the Steam version.
This Chinese version will be the 4th PC version of the Maitetsu then and will indeed feature additional content. However this Chinese edition (yes I know it has Japanese text too) is not out yet. The Japanese only version of -pure station- on PC is and that content is identical to the Steam version (that also includes Japanese text too, rejoice Japanese fans with all these version.)