2006-2011 k20 dipstick part number: 15650-RRB-A01
2012+ k24 dipstick part number: 15650-R11-A01
I can't tell from the pictures on collegehillshonda.com, but there must be at least a slight difference between the two if they have different part numbers.
I'm thinking it could be as simple as they are different lengths, since the k24 is physically bigger