It's important to remember that the decisions were made by two different kings. Christian X and Frederik IX each had their own way of dealing with dynasts who married commoners - just like Margrethe II has her own way. There is no "golden book of rules" that forces one monarch to do and think exactly like previous monarchs - contrary to what people sometimes think on these message boards.
When Christian X had to find a solution for Prince Aage, he looked to Sweden and saw that Prince Oscar had been allowed to keep his princely title after marrying beneath his station. When Frederik IX had to find a solution for Prince Oluf, he might too have looked to Sweden and seen that two of his brothers-in-law had been stripped of their princely titles after marrying commoners.
Further, it makes sense to me that Oluf, Flemming, Ingolf and Christian - who were Highnesses - were treated differently than Aage, Viggo and Erik, who were Royal Highnesses.
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