Why is it that when I drop in a video and audio into a sequence where the wav audio is exactly the same the mp4 audio, it is never in sync?

I have an MP4 and a WAV. The MP4 has the exact same audio in it. As a test, in premiere I create a sequence with the two files. They are in perfect sync. I drop them into descript into a sequence using Create Sequence on the two. Then they are not close to being in sync. WHY? It is not easy to get them back in perfect sync given the waveform controls. At least let me make those wveforms taller so I can find a good spot to sync on. There's gotta be a better way to handle this.