There is an argument that the iPhone 6 Plus is essentially a large iPhone 6. But when it comes to Apple, the conventional wisdom can be misleading. On paper, it does look like an oversized iPhone 6. It has a bigger screen and a little bit extra in terms of hardware.
basically the iphone 6 plus is just a enlarged mirror copy of iphone 6 which just has a plus added to it in all terms ( monatray, software, hardware, etc)
signing off
R.Tandon