The tones are drastically different. Story of Ming Lan is more slice-of-life, while Story of Yanxi Palace is more palace intrigue, but there are core similarities.

FEMALE LEADS - If you love Ming Lan's intelligence and loyalty, give Wei Yingluo of Story of Yanxi Palace a try. Yingluo's a more... cutthroat version of Ming Lan. She, too, if very clever and loyal to a fault. She doesn't set out to scheme against others to climb ranks or such, but try to wrong her, to frame her, to harm those she loves and she'll plan against it and set traps accordingly.

COSTUMES - Just... stunning. I'm not a huge fan of the Qing dynasty male hairstyles (that braided half-bald look) but I love this show so much I was able to get past it, haha. The hair pieces are stunning velvet flowers or metal jewelry. Clothing and accessories also have much to do with each 'palace's mistress and displays their character.

CINEMATOGRAPHY - Beautiful in both.

I would say the biggest difference that people may find difficult is the romance. I don't want to spoil anything so just watch the trailer if you want more information.