The photos were published by Chinese repair firm GeekBar and spotted by Nowhereelse.fr.
The logic boards of the upcoming iPhone models are placed in comparison with that of the iPhone 5S and both appear larger in size.
The components of the iPhone 6 models appear similar but they have two different serial numbers: 820-3675-04 and 820-2486-09.
Another distinct aspect between the two is the design and the screw hole layout.
Citing its Chinese sources, Nowhereelse.fr writes that there might be a small space to accommodate an NFC chip on both models.
Last week the French site posted a series of photos of the logic board of the iPhone 6.