The decision of whether the cabinets in the master bathroom should match the ones in the kitchen and the 2nd bathroom is entirely up to your personal preference and design aesthetic. While some people prefer a consistent and cohesive look throughout their home, others may prefer to have distinct styles for each room.
Matching cabinets can create a sense of unity and flow between spaces, providing a harmonious look throughout the house. It can also make the overall design feel more coordinated and balanced. On the other hand, having different cabinets in the master bathroom can create a unique and personalized space, allowing it to stand out as a separate area within the home.
Consider the overall style and theme of your home, as well as your personal preferences. If you value consistency and want a cohesive look, matching the cabinets in the master bathroom to the ones in the kitchen and 2nd bathroom can be a good choice. However, if you prefer variety and want to create distinct experiences in each room, it's perfectly acceptable to have different cabinets in the master bathroom. Ultimately, it's a matter of personal taste and the overall design vision you have for your home.