I found an Aebersold book which explains it...

C7+4 can also be played C7+11 or C7b5. In BIAB, either C7#11 or C7b5.

C7+9 can also be played C7 Alt, C7+9+5, or C7b9+4. In BIAB, C7Alt or C7#5#9 or C7b5b9

Thanks all