OCR level 2 adult numeracy equivalent to GCSE?

No it is not. Adult Numeracy qualifications are competency qualifications and are assessed by means of a 1-hour, 40 question multiple choice questions - this is not as full as a complete GCSE. The two awards are at the same level but not equal in coverage of maths. Yes they are, there are many unit's of course work to complete, before you can sit the test. Numeracy Level 1 - GCSE D - G

Numeracy Level 2 - GCSE A - C