The two doors both begin with Hamzat-ul-Wasl, but their internal structures differ.
Key markerExampleDoor
Silent ن before the final root letterاِبْرَنْشَقَIf'inlaal
Final root letter doubled with ShaddahاِقْشَعَرَّIf'illaal
Their Masdars also help: اِبْرِنْشَاقٌ versus اِقْشِعْرَارٌ.
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Derived Quadrilateral (with Hamzah) - Bab 2: If'inlaal & Bab 3: If'illaal
The two doors both begin with Hamzat-ul-Wasl, but their internal structures differ.
Key markerExampleDoor
Silent ن before the final root letterاِبْرَنْشَقَIf'inlaal
Final root letter doubled with ShaddahاِقْشَعَرَّIf'illaal
Their Masdars also help: اِبْرِنْشَاقٌ versus اِقْشِعْرَارٌ.