The angle of both wingtips in space is the same.
The wingtips climb at the same rate, if they were not, you would be rolling.
The inner wingtip moving slower than the outer - otherwise you would not be turning.
As the inner wingtip is slower, takes longer to move a given distance, so will climb more in that given distance than the outer would in the same distance - it is rising at a steeper angle. So, it's angle to the relative airflow is less.
That's true enough for a climbing turn, Mark -- it's the "staircase" that was used as an analogy earlier -- but here's the passage Goggles quoted from Pratt (I don't have the book so I can't verify it)
“When turning there is an increased tendency for the wing to drop at the stall, but not in the way you might expect. In a balanced level turn, the higher (outer) wing has a higher angle of attack than the lower wing. Therefore the higher wing will reach the critical angle of attack first and stall, actually rolling the aircraft out of the turn.”
The claim is that the outer wing has a higher AoA than the inner wing in a
level turn. I don't believe that it's true.