“如果文件A條款與文件B條款抵觸,以文件A條款為準”
In the event of any conflict between (the terms of) document A and document B, (the terms of) document A shall prevail.
“如果文件A條款與文件B條款抵觸,文件B條款無效”
In the event of any conflict between (the terms of ) document A and document B, (the terms of ) document B shall become null and void.