Chosen Solution

Apparently I ordered the part for the wrong iPhone can I return it and order the correct one? I ordered the home button for an iPhone 6s plus instead of an iPhone 6s

6s and 6s plus use the same home button. The parts are interchangeable between the models for the home button, same follows suit for iPhone 6 as well.

It depends on which website you ordered it from, if its amazon than yes but if its some Ebay seller or a private seller on an independent website, you would have to look at their return policy on their website.

I ordered it from ifixit

As Ben said the home buttons are the same, just remember not to expect the touchid to work…