Rat/Aries meets Dragon/Leo at a strong 88–92%, both halves natural-born achievers, both ambitious, both used to running the room. The fiery Ram and the Dragon king walk in together and the lights, somehow, get brighter. The challenge is figuring out who tells whom what to do.
Chemistry is high-octane and a little competitive. Rat/Aries brings the freewheeling, quick-take charm; Dragon/Leo brings the regal pull and the demand for adoration. Both halves expect absolute fealty from a partner, and both will receive it, eventually, after some wrangling. The bedroom is a fair fight. Neither side loses gracefully.
Rat/Aries talks fast and forward; Dragon/Leo declares. Listening is technically possible. Both halves prefer to be heard. The good news: both also respect competence, so a well-made point lands. The bad news: poorly-made points get steamrolled into the carpet.
Friction is the throne. Rat/Aries plays the long game and Dragon/Leo takes the obvious one. When ambitions collide, same job, same opportunity, same room, Dragon/Leo's claws come out before Rat/Aries has finished plotting. Bloody stumps follow. The Aries bluntness doesn't help.
What Rat/Aries learns from Dragon/Leo is to stop hiding the ambition and own the throne posture; what Dragon/Leo learns from Rat/Aries is the value of strategy and letting somebody else multitask the boring parts. Together you can run a small empire. Apart, you'd both still be running things, just smaller.
At 88–92%, this is a power-couple pairing with sharp edges. Rat/Aries and Dragon/Leo win together if neither tries to win against the other.