Spit and image

"Well!" he exclaimed. "If 'tain't, 'tis the very spit and image of that there what I sees her handle! But they things be pretty much of a muchness, I reckon, master."

Like surgically detached Siamese twins, the Dutch fashion designers Viktor and Rolf are the spit and image of each other.

When they insist you’re this other woman’s spit and image, say: “Actually, we look nothing alike, aside from our skin color.”

There was also Old Miliken, who'd apparently been a whiz in his time but was now an aged drunk who looked the spit and image of the aging portrait in The Portrait of Dorian Gray.