I have not been to this group for a while, please excuse me for that.
I set kitchens for a living. I think you are referring to the foot print of the cabinets? The toe kick area? these can be packed out if the new cabinets do not cover. One more thing if you have a tile floor watch the height of the dish washer/ making sure that you have enough height to get the DW in and out.
If I can help please feel free to e-mail me as I do not get to reed all the post in this forum.