Drop-in resolution
Miyota 9012 vs Miyota 9075: do they swap?
Whether the Miyota 9012 and Miyota 9075 share a case, and what changes if you move between them.
Close in diameter, not a drop-in. The Miyota 9012 (26.00 mm x 3.90 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 9012 is a 90-series premium automatic with a 24-hour sub-hand and date. The Miyota 9075 is the Miyota true-GMT (traveller) automatic, in affordable GMT travel watches.
They differ in height (3.90 mm vs 4.92 mm), calendar layout (centre seconds, date at 3, 24h sub-hand vs centre seconds, true GMT 24h hand, date at 3). A 90-series slim automatic at 26.00 mm x 3.90 mm with date at 3 and a 24-hour sub-hand. It shares the 90-series footprint and dial feet with the 9015 but needs a dial with the 24h register.
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.