No. There are two collections classed as "PET
64s" -- the
true PET or Educator 64, which is just a regular 64 in a PET
case with a monochrome monitor; and the 4064, which also
appears in PET cases, with a modified Kernal that turns the
background to black, text colour to white and all sprite
colours to black during interrupts.
Sounds grand - I've not heard of the other one before!
*/me files under 'today's learned things* :)