Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We hereby consent to the use in the Prospectus constituting a part of this Registration Statement on Form S-1 of our report dated July 24, 2026, relating to the financial statements of K2 Capital Acquisition II Corp. as of June 30, 2026 and for the period from June 5, 2026 (inception) through June 30, 2026, which is contained in that Prospectus. We also consent to the reference to our firm under the caption “Experts” in the Prospectus.

/s/ WithumSmith+Brown, PC

New York, New York

July 24, 2026