The pair with the different numbering that has the same chance of rolling results as a standard pair is Sicherman dice.
No luck on most of them, but I did find 0-9 twice d20s and 1-3 twice d6s:
20 Sided die with 0-9 twice (1)
Random d6 with 1,2,3
I know I've seen Sicherman before but I can't...