Yes — the 18-135mm included in the K-70 kit is the same lens as the one sold separately, not a lower-quality version.

A “kit lens” simply means a lens bundled with a camera body. It does not automatically mean inferior build or optics. Manufacturers often pair entry-level bodies with inexpensive lenses, which is why kit lenses sometimes get that reputation, but the lens itself is still the same product whether bought in a kit or on its own.

In most cases, buying the camera and lens as a kit is cheaper than buying the body and lens separately. The main reasons to choose body-only are if you already own lenses, or if you’d rather put the money toward a different lens that better suits your needs.