Yes; Microsoft Update & Update Catalog are basically one process. We wanted to delay automatic update downloads until next week...
Why do you need the Update Catalog? You can download the .EXE and extract the .MSP if that is what you need. I just tried it: download the .EXE to any workstation that does not even have Exchange installed. Double click on it. It might UAC prompt, approve that. It will open a CMD window and throw an error but the CMD window will show you where the .msp was extracted (in my case, C:\Users\(username)\AppData\Local\Temp\) - simply grab the .msp from there before cancelling the installation / pressing OK on the error popup (which will initiate the cleanup of the temp folder).