T-ROC is not in the German fleet but I would say it fits below the Tiguan in the range, which is a JGAR "premium medium SUV," the same as an X1. If there were any in the German fleet, it'd probably be in a group below - either a nice compact, the small SUV in with the Open Crossland X (it's much better than that) or classed in the G "priced like a midsize sedan, so we'll pretend it is one" bucket. There is zero chance it's equivalent to a group X premium standard SUV.
In Denmark, the XC60 is a group X, too. A T-ROC would be a C1 (Hyundai i30 or similar) or, possibly, a group K. But C is a standard designation for a "compact." I'd be extremely happy to get one of those on a compact reservation, even if it's not a formal upgrade - but there is no way I'd accept that it's not a downgrade from a premium SUV.