Home care and residential aged care both fall under the same broad qualification (usually a Certificate III in Individual Support), which can make them look interchangeable from a training standpoint. In practice, the day-to-day work is different enough that most people clearly prefer one over the other once they've tried both.
Home care means working alone in a client's home for most of a shift, with no colleague down the hall if something unexpected comes up. Residential care means constant access to team support, but far less autonomy over how a task gets done. Workers who like working independently and problem-solving on their own tend to prefer home care; workers who value having backup nearby tend to prefer residential.
Home care visits are typically scheduled in blocks — an hour here, forty-five minutes there — with travel time between clients, which suits people who like variety and don't mind driving. Residential shifts are longer and more continuous, with a fixed group of residents across the whole shift, which suits people who prefer depth over variety.
Because the qualification overlaps, it's genuinely possible to pick up casual shifts in both settings before settling on one. Several workers who've done both describe it as a useful way to figure out which working style actually suits them, rather than guessing from a job description alone.