Earlier Brother model comparisons
Brother PT-12 vs PT-12N: read the cassette code, not just the name
Similar names, separate Brother catalogue identities
Brother's Office & Home catalogue gives PT12 and PT12N separate rows and separate exact product pages. That is the first practical distinction to keep: the final āNā is not a safe abbreviation or a finish code to ignore when you are choosing old tape. Both products are discontinued. A used listing may abbreviate the name, show only a stock photograph, or pair the machine with a cassette; match the product name on the machine and the code on the cartridge before assuming what is supported.
What the current manufacturer pages say
Brother's exact PT-12 and PT-12N product pages each show a TZe compatibility table, QWERTY layout, a two-line maximum, and a label-length setting. Each page also recommends TC-family cassette supplies. Brother's current TC6001 supply page lists both PT-12 and PT-12N as compatible with that particular 12 mm cartridge. The same named supply compatibility is useful to an existing owner, but it doesn't prove the two machines are identical or that every TC width works in both. TC6001 is specifically a black-on-blue laminated cassette; shared 12 mm width is not evidence that every color, cassette body or print route will fit. If your work needs another TC product, consult the exact compatibility record rather than generalizing from this one cartridge.
For PT-12N, the official product record contains a further media conflict: the TZe specification field and the TC-supply recommendations coexist on one exact product page. The separate supply page directly names PT-12N for TC6001, so that exact TC cartridge is documented; the broad TZe widths should not be blended into the TC plan or used to claim interchangeability. The PT-12's archived model-specific brochure shows its own housing and a historic promotional bundle, but it does not establish the N model's body, package contents, power route, or interface. The N model's exact product page currently lacks a usable product image and its manual path ends at Brother's general error page.
How to choose between an existing PT-12 and PT-12N
If you already own one of the machines, start with the label on that exact unit and match its cassette code. Brother's supply listing gives the clearest common route: TC6001, a 12 mm black-on-blue laminated cassette named compatible with both. If you need another TC width, TZe-only work, AC power, a particular screen preview, or repeat jobs from saved memory, the surviving sources here don't answer enough about the exact operating configuration. Do not infer from the shared name, the same maker, or a familiar width.
For a secondhand purchase, ask for a close photograph of the printed model identifier and an actual test using the intended cassette. Verify the cassette door and tape path, and don't count accessories from a promotional image as items in a used package. Brother lists each model as discontinued, so consider the supply route before considering a low price. A seller's bundle can be unique to that offer and does not upgrade the machine's verified capabilities.
When a current machine is the safer fit
If you are setting up a home or small-office label routine from scratch, compare the PT-D220 rather than treating it as a guaranteed replacement for either vintage model. Its own current-reference documentation and media plan can answer today's power and operating questions more directly. It does not make the PT-12 or PT-12N parts interchangeable. The PT-12N can appear when earlier models are explicitly included and Brother TC is the needed supply family; the PT-12 has its own PT-12 evidence. For a TZe-only or device-interface requirement, choose a product whose exact configuration has no unresolved cassette conflict and whose manual documents the route.
Related reviews: Brother P-touch PT-12 and Brother P-touch PT-12N. Manufacturer sources: Brother's PT-12 page, PT-12N page, and TC6001 compatibility listing.