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If a beastmaster and his beast (the master has one wound, the beast has 4) takes 5 wounds that ignore their armor, do both models die, or can wounds be allocated (3 on beastmaster, 2 on beat) so the beast survives?

The wound allocation rules MAKE you put them equally on all the models. As the beastmaster is different "in game terms" to the beast, any wounds he takes cannot carry over onto models outside of the wound group.

Or, in other words: you can put 3 on the master, 2 on the beast, and the extra 2 wounds on the master are "lost"

Clearly covered in the rules for shooting at complex units - look for the marine example where an AP2 and "normal" wound are stacked onto a Space Marine, which is unique compared to the rest of the unit, so the exctra "normal" wound cannot hurt the rest of the unit

I'm going to assume that the beastmaster and the beast are not identical in gaming terms and so form a complex unit.

Then I believe you can allocate the wounds in this way. For complex units you have to allocate the wounds evenly amongst all the models before you move onto saving throws/casualties.

Once you have unsaved wounds within a group you may not spread them among multi-wound models to avoid a casualty. But that isn't an issue here.

Edit: I hereby petition the mods to force nosferatu to change his nick to "ninja grandmaster."