Well, thats the thing! You cannot compare those two results. because in some breeds you can have a dog with bad hips, ie for ex a D, but this one can be on a pennhipscale compared to other dogs from the same breed be in the 90th percentile, because the whole breed is bad.
If you really want to compare, but in fact it is not possible , you need to evaluate the pennhipscore and not the percentile, so a DI of less than 0,3 could be HDA. But pennhip doesn´t work like that