I have been keeping an eye on this because I have used both the hexies and the diamonds - but not together. My 60 degree diamonds I use to do the tumbling blocks quilt - which when put together make a hexagon. And since the interior angle on a hexagon is 120 degrees, half would be 60 degrees.
And the 45 degrees doesn't work out for me mathematically - because the angle for the interior of the center instead of being 120 - which is as it would be in the 60 degree diamond it would 135 degrees for the 45 degree diamond.
Please post when you find out, I am curious if my math is correct.