Statisticly speaking I'm sure there are more old comptech 4.55 running around than OS Giken 4.44.
I really don't know which R&P I have. Maybe someone here had work done on their car at R M Racing in Scottsdale, AZ and they would know which R&P they used (they are no longer in business). Both seem to me to be very close as far as performance goes. I'd be happy either way.