I believe you, but look, this is what I mean, in the game they're clearly a bit larger than the original rtp characters.
The XP Sprites were created by Mack. I think they were designed for Game Maker. Can you send me the rtp animated png to jensen_305@yahoo.com I would like to get a comparison sprite and see if they are different sprite types. Are those rts sprites RPG Maker "Tall" sprites? If so, they are different base and items than the XP sprites in Sprite Creator.