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What is the structural difference between the past active of Bab If'ilaal (اِحْمَرَّ) and Bab If'eelaal (اِدْهَامَّ)?

Derived Trilateral (with Hamzah) - Bab 5: If'eelaal (Idheemam)

• Bab If'eelaal has an added Alif (ا) before the final letter
• Bab If'eelaal has a Meem prefix
• Bab If'eelaal has no Tashdeed
• They are completely identical in spelling