Changing the opening word does not remove the two-part conditional pattern learned with إِنْ.
مَنْ يَرْحَمْ يُرْحَمْ
Condition verb: يَرْحَمْ — jussive with final sukun.
Answer verb: يُرْحَمْ — jussive with final sukun.
أَيْنَ تَذْهَبُوا نَذْهَبْ
Condition verb: تَذْهَبُوا — the inflectional nun is removed.
Answer verb: نَذْهَبْ — final sukun.
Identify each verb's own ending group; do not expect both to change visibly in the same way.