The "loud" version peaks at 0dB; there is no clipping of the waveform. If you want a disc with just the '77 mix, then this would be a better choice because it has a greater bit-depth.

If you are making a DVD containing AC3 encodes of both the '77 mix and the '93 mix, you can account for the level difference by making use of the dialnorm metadata in the AC3 stream. So for example, the '93 mix should have a dialnorm of -27dB (which is the average dialogue level). If you set the dialnorm level of the '77 mix to -23dB, then it will be automatically normalised to the "reference level" on playback.

If you just want to compare the two WAV files side by side on your computer, then you should get the reduced level version.