Left: Prince Harry
Right: His mother’s bodyguard

Left: Prince Harry
Right: His mother’s bodyguard

Ha! Well, well, that’s interesting!
No doubt that Princess Diana’s bodyguard went above and beyond the call of duty, and not that either of them minded.
So if we examine the male-pattern baldness that is very evident in the elder and beginning with a vengeance in the younger, they are indicative of the mother’s genes…but not their paternal nor maternal grandfather’s or father’s genes. The boys look like siblings, gentler features, less horsey-ness. Perhaps they are both not of Elizabeth’s direct bloodline.
And William resembles his mother much more than Harry, who resembles the bodyguard James Hewitt.
The nose is a dead giveaway.