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Manufacturers often create pickups as a set, with different models for the neck and bridge to provide a more consistent tone when switching between them. This doesn't mean they have the same tone - it's impossible to get the same tone given that they are "looking" at different parts of the string, which physically must behave differently. And it makes the guitar more versatile to be able to use the different positions. The goal is to try to make the output levels consistent, as well as not have one sound dramatically different from the other.
So part of the purchasing process is determining if you want to replace all your pickups with a set or specific ones and doing research to see how well the new pickup will match the remaining ones for other positions. Also, make sure you know what position a pickup is typically used for - you may really like clips you heard of ___ pickup, but if those clips have it in the neck and you put it in the bridge slot, it's going to sound a lot different.
Also, if you just want one pickup, make sure you are getting the neck/bridge version you want - they may have the same name. For instance, John Petrucci uses a Dimarzio Crunch Lab in the bridge position and Liquifire in the neck position. These pickups have no neck/bridge variants, so you know exactly what you're getting. But if you wanted to get a Dimarzio Gravity Storm pickup, there's a Gravity Storm bridge and a Gravity Storm neck, which are very different pickups.