Notice the Norcold has a little cup to catch the thawed frost water. The Dometic does not. That's why you'll see the end of the white tube in the Dometic pic, stuck out through one of the holes or slots in the lower vent cover once it's back in place.
The Dometic tube should have a little black plug in the end. It allows water to drip out while keeping bugs from getting in. It also reduces the air flow through that tube. Believe it or not, the cooling in these RV fridges is so "fragile" that too much air flow will hinder the fridge from reaching a low enough temp.
Some fridges want a little bend in that tube to form a "trap" holding water so air can't flow, but more water will push through.
If God's Your Co-Pilot Move Over, jd
2003 Jayco Escapade 31A on 2002 Ford E450 V10 4R100 218" WB