- They both have brown eyes.
- Cheng Xiao has black hair but Yeonjung has light brown hair with blonde highlights.
- Cheng Xiao was born in Shenzhen, China but Yeonjung was born in Gyonggi Province, South Korea.
- Cheng Xiao was born in 1998 but Yeonjung was born in 1999.
- Cheng Xiao was a mentor on Idol Producer but Yeonjung was not.
- Yeonjung was a member of I.O.I but Cheng Xiao was not.
- Cheng Xiao can play Guzheng but Yeonjung can play guitar.
- Cheng Xiao is in the sub-units Wonder and αγύρτης but Yeonjung is in the sub-units Natural and φορεύς.
- They are both in the group Cosmic Girls.
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