Color makes no difference. It's what's on the inside that counts. Joke aside, my uncle once had a black Game Genie with a thin board that fit in a toploader just fine.
Interesting. To fit my black one in the slot, I really have to jam it in. Makes it hard to pull out.
>_>
<_<
Giggity.
But seriously, careful when sticking any Game Genie into a toploader.