As you have new ones down one side (same rotation, so can't be swapped to the other side), and the Conti 5s are better than the Conti 2s, you do have a mix on the same axle (for both axles) - you need the old ones swapped out too.
VAG seem to get a lot of obsolete variants of tyres as OEM fit (minimum costs for "decent/premium" tyres I presume), which is a real bother when you have a puncture and only want one replaced - you can't find them in retail.
The XL on the new tyre denotes a high end load rating, probably load 95 compared to load 92 on the old ones - not a bother on different axles, but on the same axle it is a concern as the 2 tyre types will flex differently under load.