SKS Bluemels Mudguards

[Domestique]

Does anyone know what the difference is between

SKS Bluemels MudguardsBlack - MTB 26" - 60mm

And

SKS Bluemels MudguardsBlack - Trekking MTB 26" - 53mm

I can make out that one is 7mm narrower than the other but is there anything different from the 700c guards other than diameter?
Thanks in advance