All of the het clowns I have, have a sharpness to their pattern. I can pick out my double hets (het clown/hypo) from any other hets I have pretty easily, they just have a different look to them. While I feel het hypo adds a bit to the color, het clown seems to change the pattern slightly and others have said it gives a little to the color also.
I should have a clutch of Pastel hypo het clown x albino eggs hatching sometime in the future (couple weeks I think), I will post the clutch and point out which ones I think will prove out, it's only 4 eggs so I'll be keeping the whole clutch so I can see which ones do prove out.