Video and Audio Files are different lengths when exporting

I'm just trying to get comforatable with a much faster Windows workstation on PPro and AE.
I just exported my first project from PPro to burn to Blu-ray like I've done dozens of times on our older Mac Pro w/o problems.
My Ppro file is 7:04:18 in length. I export the video as an mp2 Blu-ray video and import it into Encore and it shows up at that same length.
I export the audio as an aif and import it into Encore and it shows up as 7:06:19 in length--2 seconds and 1 frame longer.
Everything is CS6. File is 1920 x 1080, sq pixels, 29.97.
Any suggestions as to why this is happening?

Thanks for the feedback. I exported to aif as I was going to burn the Blu-ray on our Mac Pro in Encore, since we don't yet have a Blu-ray burner installed in our new Windows workstation.
Upon seeing your note, I re-exported the project as you described and placed the wav and mp2 in Windows Encore and they are both the same time length.
It seems the aif should be the same too... but I assume wav is likely the preferred format on Windows so will be using that as the new workflow.
Thanks for your help!

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