@MajorHavoc has it covered. It’s the flush valve that varies most. Most common is the flapper design, but some brands use plastic towers.
Fill valves are almost universally interchangable. Your variables there will be age and interference. You’d have to go back to basically antiques before things become incompatible. As for interference, units with the big float on the end of a rod may not fit in a tank that uses a tall flush valve. They make more compact styles for those situations.
All that bring said… What are you trying to fix? The flush and fill valves are by far the most common maintenance items, but if neither of those things are the issue then you’re going to run into proprietary parts fast.
@MajorHavoc has it covered. It’s the flush valve that varies most. Most common is the flapper design, but some brands use plastic towers.
Fill valves are almost universally interchangable. Your variables there will be age and interference. You’d have to go back to basically antiques before things become incompatible. As for interference, units with the big float on the end of a rod may not fit in a tank that uses a tall flush valve. They make more compact styles for those situations.
All that bring said… What are you trying to fix? The flush and fill valves are by far the most common maintenance items, but if neither of those things are the issue then you’re going to run into proprietary parts fast.