Concealed hinges can be mounted on the surface of the door or a pressed into a “cup” that is drilled into the door.  These are often called “cup hinges”.  The cup diameter is generally 35mm but that can vary as can the drill depth required to accept the hinge.  Most concealed hinges have built in adjustability so you can slightly change the position of the door without relocating the hinge.
The quick answer is yes, you can change the hinges. The hard part is what type. Cabinet doors have lots of different configurations.....full overlay, partial overlay, inset, etc., etc. The hinges have to fit the door style. There are hidden hinges that screw to the cabinet framework without major holes, and there are European type hinges that require a large hole to set the hinge into. Go to big box and look at the hinges, what is available can be mind boggling, until you understand the type of door you have.
Hi Diane….Glad to see you again and happy to see the progress on your lake home. I was a subscriber and then suddenly lost you about the time you started working on your staircase! I was afraid it had driven you away from your blog!! You showed up on another blog yesterday and now I plan to catch up on all I have missed. Thank you for accepting me again!!
Let’s talk first about metals. As a general rule, I like to keep the different metals in a kitchen to no more than two. If you have stainless steel appliances, that counts as one metal. So that leaves one other metal you can bring into a kitchen. If you’ve got brass light fixtures, that’s your one other metal. Your new hardware should be nickel or brass.