Question about Kärcher Professional NT 22/1 Ap L

What is the difference between this model and the NT 22/1 Ap? Apart from the fact that I need a plug for Switzerland and that the NT 22/1 Ap costs about 70 francs less, I can't see any difference. The "L" on the NT 22/1 Ap L probably stands for the dust class, but I don't care about that for my purposes. Thank you for your feedback