It's a case of diamond cut diamond with those two and both of them are afraid of going too far in their demands of each other.

这两个人势均力敌,双方都唯恐彼此提出过分的要求.

《简明英汉词典》

It was diamond cut diamond when the two men met because they were so sure their own ideas were right.

这两人凑在一块,真是硬碰硬,因为他俩都确信自己的意见是正确的.

《现代汉英综合大词典》

It was a case of diamond cut diamond, each team was strong.

这是一场棋逢对手的对决, 每支队伍都很强.

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It was diamond cut diamond when the two teams met.

那两队一交锋真是棋逢对手,互不相让.

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The two cats challenged each other for the disputed territory – it was a diamond cut diamond.

两只猫为争地盘而互相挑战——真是互不相让.

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