Why not take a door to the paint store and have them color match it? They can advise you on the finish that is currently on your cabs as well. Without knowing how your cabinets were originally painted (brush, spray), applying with a brush and "feathering" the edges will most likely give you OK results. Good luck!

Well you can, but if the paint police find out, I’ll disavow any knowledge of it ;-) You’re not really looking for a “brighter white,” you’re looking for a tile and paint combination with similar undertones. White Dove is a yellow white. If the tile you love makes this apparent, try a white with cooler undertones. Chantilly Lace is beautiful, and much cooler than the White Dove. It might be a great choice. White Dove Chantilly Lace

Always better off painting the entire wall. Could be the paint has changed color with age. You could try buying new paint.

The same thing happened to my custom kitchen cabinets. The trash pull was the worst, chipped all over. I had my contractor come back and look at it (2 years later) and he sent his (new) painters in who verified the wrong paint was used. So at his expense he took all the doors and sanded and repainted them (professionally resprayed) with the correct paint. It’s been 6 months and not a scratch to be found, and we’re pretty hard on them. My thoughts are that painting them with a brush is never going to look right, even if you somehow found the exact same paint which is next to impossible because paints and painted surfaces change over time and with use. Painted cabinets by nature are prone to chipping but if they’re done correctly (according to my contractor) it should be minimal.