The two things are the same in outward form but different in essence.

这两样东西外表上相同， 但本质上不同。

《新英汉大辞典》

Scholars offer three related but different opinions about the mysterious origin and significance of these paintings.

对于这些画的神秘起源和意义，学者们提出了三种相关但不同的观点。

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When each eye sees very similar, but different versions of an image, the brain thinks it is seeing depth, or three dimensions.

VOA: special.2010.01.26

My answer is, you can't change one but you can create a new one that is almost like the old one but different in a little bit.

既然你不能改变元组,你可以新建一个跟原来的元组,大体上一致但有细微差别的元组。

麻省理工公开课 - 计算机科学及编程导论课程节选

But different days of the weeks, there's a different kind of market here.

但是每个星期的不同日子，这里都有不同类型的市集。

有各种不同的魅力 - SpeakingMax英语口语达人

The Supreme Court will decide two related, but different questions, in the SmithKline case.

FORBES: Court Rebuffs Labor Dept. On Sales Rep Overtime

So he will try to position his party as being against the Tories, but different from Labour.

ECONOMIST: Politics

The tension was just as great, but different, in Connecticut, which is home to some of the country's largest gun manufacturers.

WSJ: Few states find narrow route to gun control laws