Nightlight's colors are Lucky Clover, Mermaid, Electric Banana, and Peaches and Cream.
Raindrop's colors are Lucky Clover, Mermaid, Tea Rose, and Peaches and Cream.
DH Lucky Clover, Mermaid, Tea Rose, and Electric Banana may be slightly more vibrant than the original colors, but they are very close to the original in my personal experience (I own Raindrop and rehaired the forelock on a Nightlight before selling her, and I am very particular about hair color matches
). Some people find Pink Sugar a better match than Tea Rose for some ponies if the pink is a little faded, but Tea Rose nearly matches mine. We don't know if the DH colors just aren't exact matches, or if the original colors tend to fade and so don't match exactly.