I also had a fawn and white runner and her babies looked like those from the apricot runner.
I currently have 2 ladies---1 apricot runner and 1 a solid black ??? Both are crested.
My boys are a Rouen and a Peking.
The babies I have right now look like this:
Pretty sure this is a apricot runner / Peking cross. Looks nothing like the others I have had from the my Rouen and this lady. They always had the distinct spots on the back. This one has no spots and has a yellow bib. Also has yellow tipped wings. One has a very yellow collar around its neck. The other not so defined.
Pretty sure this is my black mystery duck and my Peking male. Very black with black bills and feet. Bright yellow to pale yellow bibs. I have 5 of these so far.