WSBA has a guideline for assigning a rider to the appropriate "master men" category: how about OBRA?

Meadors, Ivan C

2007-09-10

The following excerpt comes from the WSBA WEB-SITE:
http://www.wsbaracing.com/barr.asp

Masters Men A (35+ Cat 1-2)
Masters Men B (35+ Cat 3 or *45+ Cat 2)
Masters Men C (35+ Cat 4-5 or *45+ Cat 3)
Masters Men D (50+)

My question, does the same guideline apply to the OBRA events?
I assume it would, since WSBA and OBRA generally
are comparable/compatible in other areas.