Rule 33

You may not play in a stroke play competition and match play knockout simultaneously

Rule 33-1 Conditions; Waiving Rule
The Committee must establish the conditions under which a competition is to be played.
The committee has no power to waive a Rule of Golf.
Certain specific Rules governing stroke play are so substantially different from those governing match play that combining the two forms of play is not practicable and is not permitted. The result of a match played in these circumstances is null and void and, in the stroke play competition, the competitors are disqualified.
In stroke play, the Committee may limit a referee’s duties.