Do you mean the address offset thing that makes the public addresses of some coins start with a different letter or number than other coins?
As I do not know anything about any such thing for private keys.
-MarkM-
an example for litecoin is like this
1,"LeMoKJDDXhydpx1qR9dG3Lxtwz7NHP1d7g","6uqD2FrUp4WropA4nUfsKNVyYsUxkXHQLb4q1WVggSjxWjnjbdL"
2,"LWvDq2MiEJv33prGhGh4QhdJcVrpsVb8er","6ufFtr1aEoD2bnDWWUAGLNXo1bJQd8Ts2fDPjSFmEBj5ceJzEUR"
3,"LiZJzFJYqQEK5DRZMtnhfiEMTVPSuEFahc","6ugkY3Pr5US5cYQnkPUaDk8L4EZyT5MYTx8r66bUDupbReLXwgx"
All the public addresses start with L (bbqcoin starts with b) and the private keys start with 6 (bbqcoin starts with Y)