What “matching” means
Product identifiers and your written characteristics must match exactly, including case. The calculator family, package format and relevant numerical properties must also match. Paint coverage, seed application rate and use, material density, tile and sheet dimensions, and roll dimensions or pattern repeat can keep groups separate even when their product name is identical.
A combined area estimate does not prove that cut pieces can be reused. Keep separate product identities when batch, orientation, texture, grade or other installation details make sharing inappropriate. Purchase rounding is arithmetic, not a cutting plan.