I have a few old Corsair keyboards. At one time, I was using the CORSAIR GAMING PBT Double-shot Keycaps Full 104/105-Keyset on my current one. I had to do an RMA or replacement. As a result, I had to swap out the keycaps prior to sending it out. Alas, I cannot recall if I ever put them back on the keyboard. Is there a way to tell? I mean, do the PBT Douuble-shot keycaps physically or visually look different? Is there a way to differentiate between the two? Both are in black.