两者均用于指与诉讼案件相关的欺诈行为。

extrinsic fraud为“诉外欺诈”，其所指的行为与诉讼本身无直接关系，属于一种外在性的欺诈行为，如对当事人提出假和解协议以诱惑其不诉诸法院或使其不参加听审等，其同时还指就提交法院的非实质性问题进行欺诈以阻止法院进行全面公正听证的行为；其也被称为collateral fraud（间接欺诈）。

extrinsic fraud的英文释义如下：

Extrinsic fraud is an act of deception or misrepresentation outside the event itself which deprives the victim of material information or participation. 

intrinsic fraud则为“诉内欺诈”，指在法庭上使用假的或伪造的文件、假权利主张或伪造证据以欺骗事实审之裁决者，且导致得出对欺诈者有利的判决，此种欺诈行为会对诉讼本身导致直接影响。

intrinsic fraud的英文释义如下：

Intrinsic fraud is not an affirmative misrepresentation, but instead occurs when a party during litigation has an opportunity to protect oneself from their adversary’s fraud and has unreasonably failed to do so. 

以下为相关双语示例，供参考：

In order to trigger the court’s revisory power on account of fraud under Rule 2-535(b), “a movant must show extrinsic fraud, not intrinsic fraud.” If extrinsic fraud is shown, a judgment is normally voidable, and a court’s analysis must “proceed to determine whether the appellees acted in good faith and with ordinary diligence in seeking to have the judgment vacated and whether they have a meritorious defense to the underlying judgment.” 

根据规则2-535（b），为了触发法院对欺诈的修改权，“诉求人必须证明存在诉外欺诈，而非诉内欺诈。”如果证明存在外部欺诈，判决通常是可撤销的，同时法院的分析必须“继续确定被上诉人在寻求撤销判决时是否本着诚信和普通的勤勉行事，以及他们是否对基本判决进行了有价值的辩护”。

Another example of intrinsic fraud is when a party fails to disclose important evidence that could have affected the outcome of the case. If they had the opportunity to present the evidence but chose not to, they cannot later claim intrinsic fraud to challenge the judgment.

诉内欺诈的另一个例子是一方未能披露可能影响案件结果的重要证据。如果他们有机会提出证据，但选择不提出，他们以后不能声称存在诉内欺诈来质疑判决。