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Often, yes. A replacement cylinder in the same keyway can be pinned to the cuts on the key already on your ring, so the front and back doors stay on one key and nothing else in the house changes. If the old keyway is no longer made or the key is badly worn, the new cylinder comes with fresh keys and the other doors can be rekeyed to match in the same visit.

Yes. Those cylinders let an owner change the key with a small learn tool, but only while a working key is in hand. Without one, a design such as Kwikset SmartKey is removed and placed in its own reset fixture, returning it to a blank state; other cylinder types are rekeyed by their own method instead. A new key is then set and the lock goes back on. It is a few extra minutes rather than a replacement.

Twice a year, work the lubricant the cylinder maker specifies into the keyway and cycle the key a few times; the wrong product for that model can collect grit or gum up the mechanism instead of helping it. Check that the closer still settles the gate into the latch without slamming, and look at hinges or post hardware for movement, especially after a hard winter. A cylinder that starts needing a wiggle, or a gate that has begun to drag, is worth addressing while it is still a small adjustment.

Yes, and it takes only a moment. For a house or a standalone box, an address match usually settles it. For one compartment in a shared building panel, a lease, a deed, a unit number matching the building's own records, or confirmation from the property manager does the job. This step protects every household on the same panel, including whoever calls next.