Two sisters who have a good relationship can use the same word:
Zhao Huiyi, Zhao Jingying
Zhao Zhenyi, Zhao Jingke
Zhao Weiyi, Zhao Jingqiao
Zhao Yunyi Zhao Jingxin
Zhao Yuyi Zhao Jingxia
If you want the name to have personality and reflect that they are sisters, you can use homophones:
Zhao Qiongyi Zhao Jingya
Zhao Yangyi Zhao Jinghua
Zhao Xiaoyi Zhao Jingxi
Zhao Xinyi Zhao Jingning
Zhao Liuyi Zhao Jingwan
The following are more pleasant names~
Zhao Tingxi, Zhao Moxi, Zhao Xiaoxi
Zhao Shuyue, Zhao Wenyue, Zhao Junyue
Zhao Shanru Zhao Xiaoru Zhao Yuanru
Zhao Xiyuan Zhao Zhenyuan
Zhao Chenke Zhao Ningke
Zhao Jinyu Zhao Jinle