请问这两个句子用什么词连接比较好?which,that?

请问这两个句子用什么词连接比较好?which,that?
1.Thank you for your lc No.97425,but we regret to say that we have found some discrepancies.
备注：lc No.是信用证号码的意思
2.The discrepancies (are需要这个系动词么?）not in conformity with the terms stipulated in our contract No.012.
这两个句子用什么词连接比较好,或者需要什么改动?

1) 第二句确实要加上一个are 才行,否则这个句子没有谓语了.
2）这两个句子虽然用which或that都可以连接,但用which的表达更加正规一些.具体可以写成：
...,but we regret to say that we have found some discrepancies,which are not in conformity with the terms stipulated in our Contract No.012.
用which修饰上文提及的dicrepacies不符点,说明这些不符点与合同所规定的条款不一致.