These numbers are the same. The CAE system was replaced by the IPI system, the new industry standard, in 2001, but the two are often used interchangeably.
These numbers are an 11-digit number that is used to uniquely identify a songwriter or publisher. Rights holders are assigned CAE/IPI numbers when they are granted membership to a PRO.
Where do I find my IPI#?
You can find the CAE/IPI of an affiliated songwriter or publisher by performing a repertory search at the respective PRO. Please note: your IPI number is not the same as your PRO member ID or the account number that appears when you login to your account. You must go to the general repertory search and search your songwriter name, and your IPI number will appear next to it.