aces99
Member
I think it is because when you go onto Apple's website and do a comparison with the iPhone 6S, it clearly states that the 6S has a "second generation fingerprint sensor built into the home button" whereas the iPhone SE has a "fingerprint sensor built into the home button".
Source: https://www.apple.com/iphone/compare/#mn_p
There both built in the home button. The difference is the 6S has the 2nd gen sensor and the SE has the 1st gen sensor.