Perfect Pippo. Thx for the update, complete information and detailsIt is not a direct swap.
HAND SIZES:
Miyota 8215 100/152/17
DG2813 100/150/17
DG4813 100/152/17
MOVEMENT and STEM HEIGHT:
Miyota 8215 5.67mm - 2.5mm
DG2813 5.45mm - 2.5mm
DG4813 4.6mm - 1.8mm
Also the dial feet position seem to be different:
Miyota 8215 around "25" and "50
DG2813 around "28" and "54"
DG4813 around "25" and "55"
Additionally, date wheels are not interchangable as far as I remember.