Yes it is. I used the Downloads search and apparently clicked on the one right next to the one I wanted. here is the correct one.
http://www.subsim.com/radioroom/down...o=file&id=2901
Of course what's really weird is that SH4 has lifeboats in it already. That's where Rubini got the idea to start the one for SH3. Maybe PE4 removes them, so a mod was needed to put them back in.