Hmm, this is annoying.
I had a little look, and Picard will display the tick next to files that don't have any new tags to be written/changed.
So you can perhaps remove some tags when you load the files (eg delete all the album titles using your music player or mp3tag), and then re-save all of them (except the ones you're wanting to fine). This way you wont have to re-match everything, as long as you haven't deleted the MBID's, but you will have to re-save everything.
The other option is to load them in, drag them into the left panel, and then into the correct album on the right again... which will highlight them again if needed.
Really seems like there should be an easier way, but I haven't found it! Sorry.