[MrDresden]

There exists a saying in Icelandic exactly for this situation; 'it matters if you are reverand John or just plain John' (is. 'það er ekki sama hvort er Jón eða séra Jón')

[Leparamour]

I think a similar well-know idiom is:

"Quod licet Iovi, non licet bovi."[0]

("what is permitted to Jupiter is not permitted to an ox")

[0] https://en.wiktionary.org/wiki/Appendix:List_of_Latin_phrase...