I failed to give conversion instructions. There are a few conversion of results to be made from Ancestry.com to ysearch/FTDNA results. http://www.irishtype3dna.org/ConvertMarkers.php
Converting from Ancestry to Ysearch
Adjust the following before entering your Ancestry markers in Ysearch, (includes the revision to Y-GATA-H4 01 Oct 2009)
DYS441 Subtract 1 (- 1)
DYS442 Subtract 5 (- 5)
DYS452 Subtract 19 (-19)
DYS463 Subtract 2 (- 2)
Y-GATA-A10 Subtract 2 (- 2)
Y-GATA-H4 Subtract 1 (- 1)
Setting up a Ysearch ID
Ancestry.com offer 46 markers, including DYS 19b, 464e and 464f.
Of those 32 are comparable with the FTDNA 37 markers tests.
I'm not sure how many people have a result at 19b, 464e or 464f, many have - , so that may give you three more to compare.
Another 2 markers are comparable with the FTDNA 38-67 panel.
9 are not comparable with the FTDNA standard test.