Hehe!
Simon, both photos your are looking for (1) p68 & (2) p 17 are from the same "white4" but with different tails, even at Kassel White4 stay an A-1 and got the 1./JG1 diving eagle emblem on portside
If you want to see Yellow4, and i bet you want, you need to look to the third airplane in the row inside (1) p67 and (2) p31 (as i already told you it's the same photo inside both books). And you will see Yellow4 is an A-2 not an A-1
