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Jetrell Fo said:
If the changes don't affect frame count, yes. Its possibly not worth it though. If the mix hasn't been changed since the theatrical release, then the lossless audio on the blu-ray is better.
At least having the theatrical audio is beneficial for preservation.
It's only really beneficial if the mixes differ. If they are the same then there is no benefit to cinema DTS. Its compressed, only partially discreet, and has a lower bit-depth and fewer samples per second than a lossless track found on a blu-ray. At least some Cinema DTS discs, if not all, have clipping in places too.
That said, it could be useful in determining whether there are any differences in the blu-ray track. If there do prove to be some, it would be worth preserving.