You should find it will. Mines has 19" wheels with the 18" space saver. That was a factory fit. Dealers went on to sell Leon kits for the
Ateca in that size and people bought them off the net as well when dealers said they couldn't fit the original. The tyre was the same just the way the tools, jack and Leon surround are packaged to the fitted
Ateca which has a moulding surround with cubby holes to take the parts.
People just put the Leon trye under the floor. Not as pretty as the factory fitted
Ateca one but you never look under there. At one stage, may still be the case the
Ateca moulding wasn't sold so dealers that got hold of the wrong car for s customer had to supply the Leon one. Just the finer points
.
Should not think there is anything special with the 2020 in this regard.
The build code for mine were
PG6 VWGROUP
18-inch spare wheel as temporary-use spare tire, tool kit, jack
+
1G9 VWGROUP RER Space-saving spare wheel for temporary use, radial tire (5-hole)