A better translation of 假作真时真亦假，无为有处有还无。
One of the quotes you give is from David Hawkes, published, translation. It goes as follows:


  Truth becomes fiction when the fiction’s true;
  Real becomes not-real where the unreal’s real.


You can also consider H. Bencraft Joly's, older, published, translation of the sentence looks like this:


  When falsehood stands for truth, truth likewise becomes false,
  Where naught be made to aught, aught changes into naught.


Gladys Yang and Yang Xianyi's translation:


  When false is taken for true, true becomes false;
  If non-being turn into being, being becomes non-being.