Stipple is definitly the hardest to patch in.
Swirl & combs I find are easier as you have an edge to work to.
Eg. cut out patch, reboard, scrape back swirl/comb pattern about 12" or more from board edge following the pattern & leaving the edge of the swirl/comb,
tape & joint the board, once dry seal area, apply artex & pattern to match existing, run a wet brush at edges then pattern again around the edges to soften up the edge so it's not a sharp finish & won't stand out.
Also match pattern & thickness on a bit of board first.