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Is that RIB the one with a Soozook 55? Supersport S4.65?
I've been out on a few of these and I have to say, I don't rate them - they have a medium vee hull which slap like hell in anything other than flat calm.
Other differences are a moulded GRP deck and a layout & construction much more leisure orientated than the rescue/commercial ruggedness of the Searider.
These were available in 3 formats: an open boat, a centre console version, or the most popular layout had an aft bench seat & small steering console offset to starboard, with an optional single seat in front of the console - very Med looking. They were only made from around 1990 to 1995, when Avon dropped them and soon afterwards re-invented the 4.7 Searider as an Avon Adventure.
You really can't compare the S4.65 with a 4.7 Searider and for that reason, they can be bought cheap.
If it's not a S4.65, but a S4.00 Supersport, then this has an even flatter hull - basically a SIB with a plastic floor. Again, leagues apart from a 4m Searider and only really suited to pottering around inshore. These didn't have a centre console option, but a steering bar thingy with a mounted Teleflex helm could be fitted to the top of the tubes and an inflatable seat fitted to the deck, which looked like a lilo folded in half! I can't imagine how uncomfortable this set-up would have been.