Earlier model comparisons
PT-320 vs PT-D410 vs PT-D460BT: compare cassette and input routes
The PT-320, PT-D410 and PT-D460BT can all look like keyboard-first P-touch label makers, but they serve different tape and input eras. The choice that changes the result is whether you are maintaining a PT-320 you already own or choosing a current connected machine. Do not turn the PT-320's older TZ width into a claim that it can take current TZe cartridges at the same width.
If you already own the PT-320
The discontinued PT-320 remains a workable on-device typer for short names and basic organizing. Its user guide supports a manual QWERTY keyboard, a one-line screen and manual cutting. It documents Brother TZ cassettes in 6, 9, 12 and 18 mm. Brother's current PT-320 U.S. record separately lists TZe widths from 3.5 through 12 mm, and current Brother supply pages include PT-320 on their compatible-model list. Treat those as distinct configurations. If your job needs 18 mm, confirm you mean original TZ, not TZe; if the old cassette is missing, check the unit's tape-bay labeling before sourcing a replacement.
If you need current TZe and a keyboard
The PT-D410 is the simpler current step for someone who wants a built-in QWERTY keyboard and an additional computer-USB input plan while using TZe media. Its documented TZe maximum is 18 mm. It still asks you to create the message rather than choosing a phone app as the core workflow. The PT-320 manual's original TZ range may also reach 18 mm, but the media generations are not interchangeable facts: the PT-D410 is not a 18 mm TZe confirmation for the PT-320.
The PT-D460BT makes more sense when local keys should coexist with connected work. Its assessed plan includes computer USB and mobile-app input along with Bluetooth; it also accepts TZe up to 18 mm. That changes the practical choice if you prepare repeated labels on a larger screen or want to compose from a phone. It is not necessary to buy a connected model just to print a few short words, however. If your only priorities are the keyboard and a compatible known cassette, the older PT-320 might still be sufficient.
Tradeoffs to check before deciding
For an essential app, computer, wireless or automatic-cut requirement, the PT-320 is not a safe substitute: those features are not part of its verified matching plan, and the user guide shows a manual cutter lever. For an existing PT-320 and original TZ cartridges, the D410 and D460BT are alternatives with newer TZe workflows—not a claim that the newer cassettes or old machine are interchangeable. For a new purchase needing up to 18 mm TZe plus local-key entry, the PT-D410 is the more direct step; add the PT-D460BT when the app/connected workflow itself matters. Check the PT-320 review, PT-D410 review and PT-D460BT review against the exact width, input and cutting needs before choosing.