Standard of what do you mean? Note that the ICE-3 already adopted the French kinematic gauge, axleload, train length standards. And the TGV Est of course forces both companies to look for compatibility.

Something he missed is quai height

Correct, but the difference has more dimensions than country. There are are different standard heights (the most used defined by UIC) used by different kinds of trains. For example in Germany, there are four standard elevated platform heights from 380 to 960 mm above railhead. This has consequences like the manufacture of double-deck car types in two versions (door high or low). The big difference you may mean, also in the previous question, was that on German main stations platforms for high-speed trains were built for the standard UIC 760 mm height, but the TGV system was for the 550 mm height. The EU adopted both in its TSI for high-speed trains. But note that to access Swiss and Austrian destinations, all ICE and some TGV trains are already suited for both platform heights (not the Duplex).

Kinematic gauge if pedantic.

To make things even more complex, there is kinematic and dynamic gauge (for vehicles) and structural gauge (for track, e.g. tunnels, bridges, wayside buildings, trees and catenary masts).

_{*Lunatic*, n.
One whose delusions are out of fashion.}