I agree to looking and not finding any of the week’s floss to DMC conversion for your 3 flosses.
Here is a way of contacting Weeks to see if they can help:

Weeks Dye Works, Inc.
1510-103 Mechanical Blvd.
Garner, North Carolina 27529

877.OVERDYE toll-free
919.772.9166 voice
919.772.8757 facsimile
Contact@weeksdyeworks.com

I found Oscar...(3011)and cattail...(3864)...and sand, but no sand castle....

Thank you both for the information. I also found Sand, but not Sandcastle. These are for 2 Easter designs by SubRosa, a designer that is new to me. Sandcastle is for the sheep in "Easter Greetings" and is variegated. Maybe I'll use a Classic Colorworks that I have that I think will substitute. Just don't have time to order WDW floss and have almost all the DMC colors. Thanks again for such quick and helpful responses.

No problem, it gave me an excuse to not do what I should have been doing.

Hello- Interesting that I was looking for a conversion for WDW Sandcastle as well, and noticed your post. I found a Blackbird Designs chart that indicates DMC 422 would be equivalent to WDW Sandcastle. I hope this helps!

Thank you Michelle, this is why more than one head is always helpful!! Have you ever had a project that just wouldn't come together? I've been counted cross-stitching for almost 40 years and have completed several of the Lavender and Lace angel designs with beads, etc, however, I made a counting mistake in the first row of this simple design. Seems like when it goes wrong from the bginning , it stays wrong all the way through, lol.