Absolutely. There are lots of small and in some cases inexplicable differences between the various RHD versions. Australia actually had 3 models for the series 3: Sport (basic, no electric windows etc, steel wheels), Deluxe & Limited. But almost all Australian series 3s were Limiteds. There was also a limited edition "Finale", which was basically a Limited with special decals and a numbered badge.
The UK ones got the JDM square mirrors where AUS got the US style.
UK got the smaller round indicators on the front guards (or wings as you guys call them

) next to the RX-7 badge which actually look very similar FC ones (could be the same in fact), whereas Australia got rectangular indicator lenses embedded into the side moulding in front of the front wheels.
UK got rear fog lamp just like Japan did - Australia didn't. I suppose this makes sense from a climate perspective.
UK and Australia both got the licence plate between the taillights with a straight rear bumper, whereas Japan and the rest of the RHD world got the black garnish with number plate embedded in the rear bumper.
Every UK series 3 I've seen has the "off black" cloth interior (which is what Mazda calls the grey/charcoal colour scheme). Australia got red and brown as well (same as the US). But inexplicably, UK inner door handles are black, whereas Australia and US are chrome plated. Weird!
UK and Australia (in the "Limited" model) got front headlight washers, as did the top spec SE-Limited in Japan, but the Japanese GT etc as well as North America didn't get them.
Australia - cruise standard, UK, no cruise
UK has aerial switch in the centre console. In that spot, Aus-spec has the cruise control switch and the aerial was automatically powered by the radio.
UK model is 10kg lighter too, which is probably due to no aircon which was standard in Australia (again, makes sense due to climate)?
Also, UK did get lumbar support in the driver's seat like Australia.
I realise I'm way off topic, but it's my wanted thread and I thought you might find it interesting. One day I'll get round to scanning my Australian brochure collection.
