The Samsung S4 models from Vietnam and South Korea can be identified by their differences, which are highlighted when placed side-by-side.
Access the rear faces of both units (S4).
Remove the rear face.
Careful examination reveals the primary differences now visible.
Compare each motherboard side-by-side to ensure compatibility and accuracy.
Inspect each model, displaying it fully.
Note the location marked by a blue circle, which indicates the vibrator.
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