Thanks everyone for the replies. Yes Arkhein, that is the game I'm talking about. There's just so much jumbled information about mini sizes that it makes it hard to compare. Some places say the CR board game (and therefore the D&D miniatures line) are 28mm, others 30mm. Then there's the whole 28mm to eye-level or top of head thing so I'm really not sure.
Reapers are "heroic" 25mm and from my understanding that is measured to eye-level so I'd wager it's 28mm-30mm to the head. I'm just looking at replacing the player's minis at this point and probably not all at once so that's why I wanted to make sure everyone (original minis and reaper replacements) are all similar in size.