are snowboarding boots and ski boots the same?
No, ski boots have an outer shell of rigid plastic with a soft ski boot liner inside. They are much more rigid all around, and are shaped so that your knees will bend when the boot bottom is flat on the ground (or locked in your ski binding). Snowboard boots are softer and closer to regular snow boots. They are not shaped to bend your legs in any particular way, and they attach to snowboards via the snowboard bindings, which strap around the boots. If you need more info on ski boots and boot linings, you can check out these sites I researched for the best ski boots and ski boot liners.
