Cosmetic or a water problem
Hairline cracking in stucco over concrete block is usually shrinkage, and genuinely cosmetic. Other signs mean water behind the finish. Cracking on a frame wall. Cracks that follow a sheathing joint. Staining below a window. Or a patch that sounds hollow when tapped. That is remediation, not repair.
Painting over the second kind hides it for a season. Afterwards it costs considerably more to put right, because by then the sheathing behind it has sat wet for a year.
Matching the texture
The visible skill is blending. Florida stucco comes in a range of finishes. A patch can be structurally perfect and still fail, simply by looking different. Where a patch will not blend, the honest answer is to re-coat the whole elevation to a control joint.
What stucco repair costs when it is caught late
Considerably more, because by then the repair is not the stucco. Water behind a frame wall wets the sheathing, and eventually the framing. What began as a crack becomes rot, re-sheathing, and sometimes a window replacement. Catch it early and it is a patch. Catch it late and it is a wall, rebuilt to the Florida Building Code.
While the wall is open
Water almost always enters at an opening. If windows are on the horizon, doing them together is cheaper and fixes the cause. See impact windows and doors.