It has a chain
No, the timing chain should last the life of the engine. No maintenance is required.
it has a timing belt that should be replaced around the 90,000 km mileage
Timing chains on Hondas are replaced at engine rebuild time, and no sooner.
Never. This is not an item you replace at a scheduled time or mileage. It should last the life of the engine.
No, a timing chain will normally last the life of the engine, but a belt must be replaced at a set mileage that is dictated by the manufacture.
You don't change them unless there is a problem. Timing chains are designed to last the life of the engine and are normally replaced during an engine rebuild.
The timing chain has no set date or mileage for replacment. It will normally last the life of the engine.
If you mean do the accomplish the same task? The answer is yes. Of course one is a belt that must be replaced at a set mileage and the other is a chain, that is normally replaced when the engine is overhauled.
The timing chain should last the life of the engine. It does not have a service interval.
A loose timing chain should be replaced.
Timing chain usually needs to be replaced each 180-200K miles.