Almost the same; very little difference.
彼此没有多大差别。
先秦·李耳《老子》唯之与阿，相去几何？美之与恶，相去何若？”
The two paintings are almost identical; they are 相差无几.
Learn the next connected idiom: 相差无几 (xiāng chà wú jǐ) → 几次三番 (jǐ cì sān fān)
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