It's a bit difficult to tell without a trade catalogue. The
Okuma website is essentially Okuma USA. However, even that doesn't show the full range of Okuma centrepins. It's missing the Sheffield and Sheffield DRII (a more colourful version of what was the Trent in the UK).
I suspect that we are down to the RAWII, Sheffield, Aventa Pro and Aventa in the UK at the moment, but none of them are that easy to source new for a sensible price. The Trent, Kennet and Martin Bowler are long gone.
The RAWII, Sheffield and Aventa Pro (bronze coloured) are essentially the same reel in different frocks. The basic Aventa (silver coloured) is supposed to lack ball bearings, though it's reputed to run on bushes, it's not a true pin.