Hello Peri,
How are you doing.
Too many questions in 1 thread 
1) IBP for Finance is IBPF and for S&OP is called IBP.. names are very confusing. They will continue to be separate objects.
2) IBPF as solution is available for non S/4 but the new version with Fiori apps works only on S/4
3) There is a certification for simple finance 1503 available which also has a section for IBPF.
Hope this helps.
Regards,
Rishab