I'm in the situation where there is no exam CD for my instrument. So for me, there's iTunes and Spotify, the latter better because it is free! Though recorder music isn't always the easiest to find many version of, for most of the stuff I play I can find at least one recording.
One of my exam pieces, I've got four different recordings of it, and they are all different. None are
wrong, they are just different interpretations. And it is very interesting to hear the differences, decide if there is one you like better (or bits of different ones that you like, and can mash together,
if they work together). Adding myself as a fifth recording is...well...illuminating

Remember the examiner isn't standing behind the instrument reading the music in the exam. The examiner is not going to be intimately familiar with every nuace of every piece on every syllabus. So small changes here and there, especially done musically, are likely to not even be noticed. One of my pieces has been written with some insane dynamics and ludicrous slurs - basically by a composer who didn't seem to be aware of the limitations of the recorder with respect to dynamics. So, we are paying some attention to these things, but only in so far as we can - some slurs are being broken because there's a necessity to breathe, some notes are not going to be
pp because they are well above the stave and simply can't be quiet. But as gets pointed out to me, don't be afraid of doing this, because the examiner isn't reading the music as I play making sure I am note-perfect in absolutely every respect. No, he's across the other side of the room, listening for a musical performance, which is so much more than just the right notes in the right order