Black Greasy 8 Eye Derby Boot Sizing

Hello, firstly I would like to apologize for creating an annoying topic like this. They don't sell those boots in my country, so I have to blind pick the size and purchase the pair from the official website.

For example, normally I'm wearing adidas Originals 46 2/3 EUR (11.5) size which fits me perfectly (my feet is 28 cm long so 0.8 works like a buffer, but it's kinda comfortable – but these are sneakers! idk how does it work with this type of shoes).

I have a wide foot with a high instep and that is the reason why I always need to pick wide sneakers to fit my feet inside so it doesn't look deformed and "unshapely" hahah.

On the adidas website it's written that the 46 2/3 shoe is 28.8 cm long. I checked the "Find my size" button on the Solovair website and it looks like I need a 43 or 44 EUR (9.5 UK) sized shoe which looks kinda odd to me because I've never had a pair that small. Do you guys think it would really fit? Should I go at least one size up? I've never had this type of shoe either.

This is the reason I'm creating this post hoping someone would help me. Thank you very much for your responses. <3