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The left-hand one is brake drum size, as @MrE has said. I’ve also got a very similar one and it’s no good at pulling bearings off because it tends to rip the outer race off the bearing. You need one of the ones which has the half-circles you tighten behind the bearing. There’s a £20 one at Screwfix which is the right shape but I can’t quite gauge the size and it gets mixed reviews. Might be worth a try. If it’s shit you can just take it back.
I need a bearing puller for occasional work on bike sized bearings, and I adamantly refuse to pay £350 for the park tool set (it’s just a slide hammer, for Pete’s sake!).
Does anyone know what dimensions these might be? https://www.eurocarparts.com/p/amtech-3pc-bearing-puller-set-553991180
And does someone have any experience with the £25 slide hammer bearing pullers off eBay and the like? Or another affordable option you’d recommend?