Actually, Sony do have a "Pro enhanced" logo used on both retail boxes and on the PS Store. The advantage is that Microsoft allows you to search by that tag, while Sony doesn't.
Apart from launch window, it's not anywhere near that close. During 2016, Pro had 89 enhanced games. During 2017, One X has 78 announced. (This number will go higher with time, though.)
In total to date, however, the gap is much larger. Pro has at least 200 enhanced games. One X has announced 118 total, but 40 of those are spread out through 2018. Of these, many will also be enhanced on Pro. In addition, some of One X's 2017 titles will similarly be Pro-enhanced, and so will a higher number of exclusives. So by the time One X hits that 118 number, Pro will probably be twice that or more. This is only to be expected with the headstart, and the bigger library.