How to move tags from many files quickly?

I ripped my CD to mp3 format before, but as hard disk become cheaper and bigger, now I determine turning to FLAC.

I have done much work on completing these mp3 tags (with this amazing software, of course), if I do it again one by one manually, that would be a nightmare. so I wonder that is there a solution could help me to move these tags into new FLAC flies.

Does anyone have good idea? My English is very poor, hope that you could unterstand what I want to express.

Thanks.

Select the mp3 files in Mp3tag, right click > Tag Copy
then load and select the flac files, right click > tag Paste

The mp3 and flac files must be in the same order and same number
Try it with a few files first.

Thank you very much, it really works!