ᐅ How can I integrate Ikea Metod cabinets into existing kitchens?

Hello everyone, I am currently planning to expand my existing kitchen using Ikea Metod cabinets and am wondering about the best way to integrate them into a partly fixed kitchen unit that is already installed. Specifically, I am interested in how to modify or complement the Metod cabinets so that they match the existing kitchen both visually and functionally, without having to carry out completely new installations. What tips are there for achieving a clean transition between old and new elements, especially considering that the dimensions are not always exactly the same? I would appreciate any experiences, particularly regarding how to compensate for possible height differences or how to combine different cabinet fronts effectively.