Basic Color Genetics: Blue Cream and Lilac Cream

Cream is the dilute version of Fawn, it's characterized by "dd".

In the SOP, there are distinction between blue tort and lilac tort but no distinction between blue cream and lilac cream.   Actually these are symmetrical: the agouti version of blue tort is the blue cream and the agouti version of lilac tort is lilac cream.  

This photo is used in the ARBA Standard of Perfection (SOP) on page 49 of 2016 -2020 edition and on page 50 of 2020-2025 edition.    Her name is Chu's Zoey and she is a blue cream.   The color genes of the blue cream are: A-B-C-ddee.   Translate into: agouti pattern, black family, full color, dilute color, non-extension color.   Color of eyes: Gray.
Blue cream is the agouti version of blue tort aaB-C-ddee.
Blue cream is also the non-extension version of opal A-B-C-ddE-. 

 

The color genes of the chocolate cream are: A-bbC-ddee
Translation: agouti pattern, brown/chocolate family, full color, dilute color, non-extension color.
Color of eyes: Gray.
Lilac cream is the agouti version of lilac tort aabbC-ddee.
Lilac cream is the non-extension version of lynx A-bbC-ddE-.

I happened to be holding these two French Angora brothers that are blue cream and lilac cream.   I wish I had put them side by side for a photo op but it was not done.     This photo of holding them gives a pretty good comparison.   Can you tell which one is the blue cream and which is the lilac cream?