I've collected whiskers from a dilute tabby (white), tabby w/ white (white), torti (ticked and black), and my three (now that I have a new cat!) black cats (black, black, black and white mix now that some of August's whiskers are coming in white).

So August was younger, I was at least mostly able to differentiate the whiskers from my black cats from the whiskers from other household cats; when August's started to go white I could differentiate some of hers from Gillian's. I also have good odds of telling them apart based on texture, ex. August's are longer and curlier, like her fur. But the final collection is a crapshoot, especially because I have so many mini-whiskers from chins and ankles, so length isn't a great indicator.

I love the visual of viewing them against white and seeing the subtle differences; it reminds me of checking the length and texture to determine if it came from August or Gillian. I love that we can know our cats bodies so well and be so connected to them in this small, silly way.