Again, two different things.... its not the nitrifying bacteria in your tank that is making the rocks pink/purple... its the coralline algae. if you want your white rocks to turn pink/purple, add coralline algae, not bio-spira or Turbo Start. You can add the algae via a coralline algae in a bottle type product or adding existing live rock to your tank. Either way, it will still take several weeks/months for the algae to find its way onto your new rock and start changing the color.
Some newer product contain both the algae and the nitrifying bacteria, but most certainly don't. As far as I know, neither Bio-Spira nor Turbo Start contain any coralline algae, just strains of nitrifying bacteria for cycling your tank and getting the biological filtration bacteria going. But these will not turn your white rocks purple/pink without adding corolline algae into the new tank somehow.
Products like the one below, contain both the bacteria and the algae though. Two birds with one stone.... but will still take time.