Just for interest I learnt a near lesson yesterday. Needed a new PZ4 20” and couldn’t fnd a TO variation anywhere. Thought I’d use a mclaren version instead. Tread looks same, all numbers match etc. Then I’m told by Pirelli agent that the mclaren version has one major difference. The shoulders in/out are different heights for adjustable race suspension and are front fitment only. His words, “ put one of those on and you will crash”. Tyres variants in the same brand and type can be very different to each other. CAUTION. Be sure etc.