Both apps have been updated to version 9.1.4, which provides support for importing projects from GarageBand for iPad. The download for Logic Express is 138.74 MB in size, while that for Logic Pro weighs in at 192.48 MB.
The updates are available through Software Update, or can be downloaded directly from the following links:
Logic Express Update: http://support.apple.com/kb/DL1015
Logic Pro Update: http://support.apple.com/kb/DL1014