“Wa-aydiyakum ilā al-marāfiq”
“And wash your hands up to the elbows.” (al-Māʾidah 5:6, excerpt)
In the ablution instruction, “ilā” identifies the limit of the washing area. An explanatory phrase equivalent to “including the elbows” may be used to state the practical ruling clearly.
That does not make the core sense of “ilā” identical to “maʿa” in every construction. Questions of whether an endpoint is included require consideration of the Prophetic practice and the juristic evidence as well as the particle itself.
The distinction is between explaining the intended application and proving all the details of the legal ruling.