As of today (18 Jan 2019), I called Samsung support to inquire about this. They confirmed that the EVO Plus and the EVO Select have identical specs, the only difference is that the Select is only sold in certain markets. The associate also added that previously, the Select had somewhat lower read/write speeds, but that's no longer the case. I can also confirm, just from shopping around, that the Select is not Amazon exclusive (I have seen it at an online competitor).
Had the same question myself so did some digging. According to the Samsung web site, the specs on the evo select and pro 126G card are identical. However, you can only purchase the select on Amazon.com - you cannot even purchase it from the Samsung store.