Although both verbs belong to Form X, their roots and meanings differ.
FeatureIstaʿānaIstaʿāra
Rootع و نع و ر
MeaningSeek helpBorrow
Imperfectيَسْتَعِينُيَسْتَعِيرُ
Active participleمُسْتَعِينٌمُسْتَعِيرٌ
Imperativeاِسْتَعِنْاِسْتَعِرْ
اِسْتَعِنْ means “seek help”; اِسْتَعِرْ means “borrow.” Their derived pattern and weak-letter treatment are similar, but the final root consonant is nūn in one and rāʾ in the other.