The individual black- and whitelist pages will be removed in one of the next versions of Pi-hole. It will be replaced by the “Domain” page you can already find under “Group Management”. Here, you will always see both of them. Does that solve your particular issue?
Also, note that checking for exact equality is only one possible case here. A user might have added added two different regex that still achieve the same matching. Very much simplified, thous could be
[a]. They are exactly equivalent but not identical. Really comparing equality in regular expressions is very hard.
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