Drop-in resolution
Ronda 5030.D vs Seiko VD53 (TMI): do they swap?
Whether the Ronda 5030.D and Seiko VD53 (TMI) share a case, and what changes if you move between them.
Different footprints. The Ronda 5030.D is 28.00 mm case fit (28.60 mm overall) x 4.40 mm and the Seiko VD53 (TMI) is 29.50 mm x 4.57 mm, so they do not share a case. This is a choice between platforms, not a swap.
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The Ronda 5030.D is the reference Swiss quartz chronograph, in a large share of quartz chronographs. The Seiko VD53 (TMI) is a TMI standard quartz chronograph (VD5 series).
They differ in diameter (28.00 mm case fit (28.60 mm overall) vs 29.50 mm), height (4.40 mm vs 4.57 mm), calendar layout (chronograph, small seconds at 3, 12h at 6, 30min at 9, date at 4 vs chronograph (seconds, 60 min), 24 hour, date), winding behaviour. A quartz chronograph at 28.00 mm x 4.40 mm with sub-dials at 3, 6 and 9 and date at 4. It is the go-to quartz chrono module; the smaller 5021.D is its bicompax relative, not a drop-in.
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.