battery replacement 0f 4439 mAh battery

IFixIt's replacement battery for MacBook Pro Model A1707 14,3 says "Replace a 6670 mAh battery" for 2017 model A1707. I've been googling the difference, and it seems that the 6670 mAh battery may be a bit large. Does anyone have any knowledge about this? Will it be too large for my computer?