The Frog Valentine was made from the Bandai molds so they are the same thing. The Bandai Valentine is supposed to be one of the better Bandai kits, except for the tracks.
I know some of the Frog kits I picked up included a sheet of peel and stick stickers as opposed to waterslide decals (M4A3 and Hetzer). Did the Valentine come with stickers as well?
about the Valentine and if you do a quick search or scroll back to a post around March 16 you will see one titled "Valentine Kiss" or I could respond to it and it will jump up to the forefront and you can visit it there.
