Problem fitting wheel spacers

[NickD]

@plip1953

Ok, so I now get what you’re saying, although it does indeed seem a bit odd that the recesses in the newer set of wheels are relatively shallower.

On a slightly different point, are you absolutely sure that the tyres won’t foul the arches when either 15mm or 20mm spacers are being used? Even with a 225 tyre on 17" +45 Rota wheels (Supercup standard non-OE wheel) I felt the need to cut away a section of the arch to prevent rubbing. And you’d effectively be running a 245/255 tyre!

It’s quite common for wheels to change, it may be for many reasons, a new mould, different supplier, manufacturing reason, the list goes on.
The offset shouldn’t be any issue at all. The Rota Force wheel is 7.5" width so compared to your 225 (Super Cup tyres are 215 40) the OP’s standard tyres will 7.5mm inboard of yours.