skates sizing

[SR27 0]

Did use the search but couldn´t quite find what I was looking for. I am wearing size 10 in regular shoes so what size would I need for say Mission HE 9500 or the older CCM Externo Skates? As those are two models I could get for cheap.

[Fury of One 6]

I wear...

11.5 - sneaker

9 - CCM/RBK

10 - Mission