Of course you can, select them in the bottom panel in the project window, then right-click one of them and select "copy pages", then go to the destination project and hit CMD-V (or CTRL-V if you are using Windows) to paste them.
To select multiple pages, just cmd-click them (or ctrl-click them if you are on Windows). If you have to select many contiguous pages, select the first, then shift-click the last.