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I have no picture from the frons, often those are difficult to make in real life. More likely a picture from above can be made. Is the difference than still visible?
I collected pictures of hungarica and dorsalis from the web and put them in two folders according to the coloration of the body: clearly striped versus hardly striped. Most happily the coloration of the bodies correlated completely: much grey / less grey. Also the gap between the eyes correlated: narrow grey gap between the red yes versus quite broad gap. So the folders were ungarica and dorsalis.
None of the pictures (very very few of hungarica unfortunately) showed the frons, none is giving a perfect perpendicular look on the head. I took two ones close to perpendicular, drew a line touching the front ocell and measured the width of the gap and the width of the eyes. Due to perspectivical distortion both eyes give different measurements, the mean of them is a better measure (but still affected by distortion). Now for hungarica the gap is about 0.75 of eye width, or in words: the gap at the height of the ocell is clearly narrower than eye width.
(I forgot whose pictures I've used.)