T120, T100, Street Twin Shocks Interchangeable?

There are many interchangeable parts between the EFI T120, T100 and Street Twin but what about the shocks? Triumph lists different part numbers for T120, T100 and ST shocks (T2050479, T2058888, T2050333 respectively), with three different prices (£366, £409, £415 respectively). But I have come across this before with Triumph, they sometimes give different numbers for the same part, depending which model it's intended for. As far as I know, no other bike manufacturer does this.
So does anyone know for certain whether the shocks are basically the same?