It's all about FEMUR LENGTH
These two girls are the same height but the gal on the right has much longer femurs (The thigh bone, connecting the knees to the hips).
consequently, she'll benefit from a wider stance squat, low bar with a more exaggerated back angle. She'll have much more trouble maintaining a high bar squat with a close stance and an upright spine.
The girl on the left is built for high bar squats with an upright spine.