But, better and more versatile, make the jokers appear identical, but give one a very subtle reveal, like the clouds in the sky over him coalescing into a shape that looks an awful like a value and a suit, subtly hidden with shading so no one would spot it unless you pointed it out. Having two seemingly-identical jokers can actually be useful to a magician.
Do you have an example of this idea?
Look at the two jokers in the Legends deck. The dragon is holding a card - face down in one joker, face up in the other. But that's the obvious change. The subtle one is when you look in the dragon's smoke, one has additional wisps of smoke that form the letters of the word "Ruby". (At least I think it was "Ruby", since I'm going by memory.) I didn't realize it was there until someone else pointed it out to me - it's insanely subtle.
A similar example would be the backs of the Ultimate Marked Deck (Bicycle Rider Back, red and blue) and the GT Speedreader Deck (Bicycle Mandolin Back, red and blue). You spread either deck to a spectator, they see nothing but identical card backs - this despite the fact that each card's value and suit are printed plainly and easily read (if you know where to look) without any weird coding system - plain letters, numbers and suit icons woven right into the design so as to seem like a natural part of it.
Legends decks are sold out but still circulating for just a touch more than original retail.
Ultimate Marked Decks are like a "Holy Grail" of magician's/gambler's marked decks - long sold out, now they're commanding prices near $40 a pack.
GT Speedreaders are still around at good prices - the Mandolin Back never gained a lot of traction after its introduction, especially after the introduction of the Maiden Back (much more attractive-looking and closer to the Rider Back in design).
Speaking of Maiden Backs, there's an excellent Gambler's Deck in the Maiden Back - stripped, marked several different ways and designed to use in a card stack. I love Gambler's Decks - I also have the original Rider Back models that will never be printed again.