Eurasian treecreeper (Certhia familiaris) or short-toed treecreeper (Certhia brachydactyla)? Sihlwald, Switzerland

I photographed this treecreeper today in the in the Sihlwald forest and nature reserve in Switzerland. According to my guidebook about the birds of Switzerland, it is very difficult to distinguish between the two species. Can anyone tell me which type of treecreeper this is? Thanks for your help! Shot with a Canon EOS R5 MarkII and a RF100-500mm F4.5-7.1L IS USM lens.

I photographed this treecreeper today in the in the Sihlwald forest and nature reserve in Switzerland. According to my guidebook about the birds of Switzerland, it is very difficult to distinguish between the two species. Can anyone tell me which type of treecreeper this is? Thanks for your help! Shot with a Canon EOS R5 MarkII and a RF100-500mm F4.5-7.1L IS USM lens.