Some deficiencies have no legally assigned equivalent. The discussion refers to takbīrs of the Days of Tashrīq and particular acts related to prayer to show that a duty can be tied to its designated occasion or quality.
A takbīr omitted in its specified context does not necessarily produce the identical legal effect if recited at an arbitrary later time. Likewise, a sunnah element of prayer does not automatically generate an obligatory substitute merely because it was missed.
Rule: A remedy cannot be invented from resemblance alone. Its legal recognition must be established.