I just had the top case replaced in my 2016 MacBook Pro 15, and they used a top case from a 2017. The tech confirmed that they use the 2017 top case for 2016 models, but the 2018 top case isn’t compatible.
The 2017 does have changes vs the 2016 to make it quieter and less clicky.
The 2017 does have changes vs the 2016 to make it quieter and less clicky.