I don't know what the plugin "moving pictures" is. But the plugin My Tv-Series is built in to XBMC, it looks exactly the same as in MP anyways. You get info about the series, it downloads fanart, plot and pictures from each episode. With one single click of the remote.
If noone told me different, I would believe they worked exactly the same in MP and XBMC.
Moving Pictures: https://forum.team-mediaportal.com/moving-pictures-284/moving-pictures-public-beta-0-5-5b-45365/
My TV Series: My TVSeries - MediaPortal Forum
TV Series does definately not work the same in XBMC and MP. And it's not that the "plugin is built in" in XBMC, it's just that XBMC has similar functionaly out of the box. My TV Series, the MediaPortal plugin, does a way better job finding out what episode a file on my share is. It often seems I either have to rename files or directories in XBMC or do a manual search to find the right tvdb/imdb information for files in my shares. But it could very well be because I've set something up the wrong way. It's also hard to know what XBMC is doing when you add shares to the library
They both have their quirks, no doubt about that