Special Event Handstamps - Christmas Postmarks

The Special Event postmarks as notified in Postmark Bulletin 39/35 29 October 2010. Can anyone tell the difference between 11923 and 11924?

11921 - 01 Nov 2010	11922 - 01 Nov 2010 replaces 11903	11923 - 01 Nov 2010
11924 - 02 Nov 2010	11925 - 03 Nov 2010 replaces 11904	11926 - 04 Nov 2010
11927 - 05 Nov 2010	11928 - 06 Nov 2010	11929 - 07 Nov 2010
11930 - 08 Nov 2010	11931 - 09 Nov 2010	11932 - 10 Nov 2010
11933 - 11 Nov 2010	11934 - 12 Nov 2010	11935 - 13 Nov 2010
11936 - 14 Nov 2010	11937 - 16 Nov 2010 to 15 Nov 2011	11938 - 21 Nov 2010
11939 - 12 Nov 2010	11940 - 02 Nov 2010	11941 - 12 Nov 2010
11942 - 02 Nov 2010	inkjet 13th-20th November 2010	inkjet 1st-31st December 2010