Charts: Billboard Top 100 vs Cashbox Top 100

[bloxx]

Hello,
sorry if my english is not very good!
I have found this forum searching through google for information about differences between Billboard and Cashbox charts.
I'm writing a database with all artists and songs which was in the Billboard chart and now I heard of those concurrented Cash Box charts.
At amazon there are a few books of different Cash Box charts (Pop Singles, Country Singles, Black Contemporary Chart and Post-Modern-Age-chart).
So, I don't know if there is a need in me to buy these books too, because I heard that in the Cash Box charts were some songs which never appeared in the main Billboard charts!
If this are only a few songs, does somebody have a list of all the tunes which was only in the Cash Box but not in the Billboard chart?
Greetings to all from Germany