I can't say for sure if there is any difference. But I can't imagine there would be much difference. I don't think there are many mods that could be done to a water pump. They are pretty basic. High flow pumps have more impeller blades which gives you better flow while using less power to do so. They also make different pump casings such as cast iron for durability or aluminum for light weight. The stock pump in your jeep should be a aluminum casing. Pumps with better quality bearings will also increase your flow/horsepower use. If you're looking at a more expensive pump, get all the info you can about it first to make sure you're not getting ripped off. Hope I've been some help.
1992 YJ, 2.5L 4-banger, 2" Lift, 31x10.5 BFG Mud Terrain, K&N Filter, Restrictor Removed, Hi-Lift, Custom bumpers, More to come...