Esthetician to Cosmetologist

Hi! I am a licensed esthetician in DE and MD, 600 hours. I recently started working in a hair salon as a receptionist and starting to be interested in becoming a hair stylist. My coworker said that since I already have 600 hours of esthetics, I could do the remaining 600 hours (I believe MD cosmetology school is 1200 hours) instead of doing the full 1200 hours. I wasn’t able to find anything about this on the web and wanted to know if anyone here knows anything. Thanks