Ying & Yang—i.e., Reilly and Camille. For Example...

1. Both are indeed color contrasts—Reilly is an Offwhite Apricot Maltipoo with angel-wing markings, and Camille is a Apricot Maltipoo with fox-like markings and some white hairs.
2. Reilly is the balance of introverted "Momma", and Camille is the balance of extroverted "Mimi".
3. Reilly is a "Polar Bear Face", and Camille is a "Teddy Bear Face".
4. Cam is more of a foodie and water drinker than Ri.
5. Reilly is bigger than Camille, whom can jump higher due to her small size.
6. Cam usually leads the trouble of going upstairs when she's not supposed to do so, and she won't stay on the bed during naptime. Reilly, on the other hand, usually leads the trouble of barking (as she did while I typed)  and bursting out the back door to eat mulch, poop, and sticks.
7. Reilly is a Patrilineal Maltese (Patrilinealtese?) and a Matrilineal MaltiJew (and you can definitely see what I did there in terms of the talking about the Matrilineal Poo[dle]), whereas Camille is a Patrilineal Maltipoo and a Matrilineal Toy Poodle. Thus, she's a MaltiJew on her dad's side. Meanwhile, Reilly's "Momma" identifies more with her Jewish heritage (and Reilly was even named in a shiyum shel haminhag Ashkenazi), whereas Camille's "Mimi" identifies with her more-remote French heritage (Incidentally, at the reunion, I found that the DeBoys are of Jewish heritage, anyway—not to mention that "Mimi" inadvertently named Camille Dominique after Great-Great-Granddad's paternal grandmother!)
8.  Cam dreads the sound of recycling and garbage trucks, whereas Reilly dreads the sound of a neighbor's macho Corvette.

By the way, blogging about Reilly and Camille provides useful writing practice—if only "Momma"/"Auntie Nicole" could become a full-time writer and stay home with her "kalvbat" and maybe babysit Cam during the day as well as become an analyst-commentator in addition to an author!