Drop-in resolution
Miyota 82S0 vs Miyota 9075: do they swap?
Whether the Miyota 82S0 and Miyota 9075 share a case, and what changes if you move between them.
Close in diameter, not a drop-in. The Miyota 82S0 (26.00 mm x 5.67 mm) and Miyota 9075 (26.00 mm x 4.92 mm) are near in size but differ in height, dial feet or layout, so moving between them means a new dial, hands and often a case adjustment.
The Miyota 82S0 is the open-heart 8200 member with a skeletonised balance aperture at 7. The Miyota 9075 is the Miyota true-GMT (traveller) automatic, in affordable GMT travel watches.
They differ in height (5.67 mm vs 4.92 mm), beat rate (21,600 A/h (3 Hz) vs 28,800 A/h (4 Hz)), calendar layout (centre seconds, open heart at 7, no date vs centre seconds, true GMT 24h hand, date at 3), winding behaviour. An 8200-family caliber at 26.00 mm x 5.67 mm with an open-heart aperture exposing the balance at 7. It shares the 8215 footprint but needs a dial cut for the open-heart window; the 82S5 and 82S7 are its small-seconds relatives.
Matching diameter and height is necessary but not sufficient. A donor is only a true drop-in when the dial-foot positions, hand-hole sizes, stem length and calendar layout also match. Two movements can share a case and still need a new dial, re-broached hands or a cut-to-length stem.