* By Manufacturer: Many different companies (Bosch, Delphi, Airtex, etc.) make fuel pumps that are compatible. So there are many different *brands*.
* By Output: There might be slight variations in the fuel flow rate depending on the engine and options. A higher-performance pump might be available, although this is less common for a 98 Neon.
* By Part Number: Each manufacturer uses its own part numbering system. Therefore, there are a large number of different *part numbers* that could fit.
* By Physical Dimensions/Connector: While the general mounting and electrical connection is standardized to some extent for a given year/model/engine, subtle differences may exist depending on the manufacturer or even revisions within a model year.
In short, while there's a limited range of *types* of fuel pumps that will physically fit, the number of *different* fuel pumps available from various manufacturers with different part numbers is quite large. You'd need to look up the correct pump by the engine code of your specific 1998 Dodge Neon to narrow it down considerably.
