- They both have brown eyes.
- They both have black hair.
- They are both in the sub-unit Wonder.
- They are both actresses.
- They both have a younger sibling.
- Bona was born in Daegu, South Korea but Cheng Xiao was born in Shenzhen, China.
- Bona was born in 1995 but Cheng Xiao was born in 1998.
- Bona can play piano but Cheng Xiao can play guzheng.
- Bona has an older brother but Cheng Xiao has a younger sister.
- Cheng Xiao was a mentor on Idol Producer but Bona was not.
- Cheng Xiao is a member of Y-Teen but Bona is not.
- Bona is in the sub-unit ενύπνιον but Cheng Xiao is in the sub-unit αγύρτης.
- They are both in the group Cosmic Girls.
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