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Oddly enough the more expensive ones are heavier and use Stainless Steel instead of Ti hardware. Maybe the Ti wasn't durable enough? There's also some difference in the uppers but it's all gibberish anyway.
One-piece Synchwire™ upper design with thermal-welded Teijin® TPU reinforcement for precise structural support and enhanced durability
XT2® anti-microbial fibre top sheet
Replaceable heel pads with stainless steel hardware
Weight: 185 grams (per shoe, size EU42.5)vs.
New Evofibre™ SL upper material, which is thin and seamlessly designed
X-Static® Antimicrobial fibre footbed
Titanium hardware
Weight: 175 grams per shoe (size 42.5)
Model year. The cheaper ones are the older ones. What the differences between them are in practice I've no idea. I've got a pair of the older model and I rather like them.