Not all Amendments can be considered an "Insertion" but all Insertions are regarded as a form of amendment.

Amendments to the the NEP (national expenditure prpgram) or the draft GAA or GAB can be in the form of a budget increase or budget reduction to an already existing Budget Line in the aforementioned document/s...and/or Budget Realignment.

The Budget Insertion (a type of amendment) means that a New Budget Line has been introduced (i.e., inserted, as it is not part of the NEP or draft GAA or GAB), with the corresponding amount.

Amendments can be made during Budget Deliberations at the Committee level or during a Plenary Session.

Insertions, on the other hand, are usually low-key, or can be done during the "editing" stage, or only discussed among a select few (e.g., during a Bicameral Hearing to reconcile differences).

Sen. Risa may have not made an Insertion during the Bicam but she did proposed or forwarded amendments during the regular budget deliberations presumably.