Ironwood (please sign all posts),
You didn't include a clue as to the model or vintage of your 11" but according to Logan catalogs from the 1950's and 1960's, the answer is no. The taper attachment for the 11" is listed as AC-295. For the 10", AC-255 or AC-298.
I just uploaded into Downloads the 1956 Logan catalog. See whether or not your 11" is included. If it is, then what I just wrote applies. The catalog of course gives no details of what's different. The only difference mentioned is that the one for the 11" weighs 2 pounds more than the one for the 10".