Dennis, to answer your question directly, the Blewett Pass Highway is close but not really "the same caliber" as U.S.2 from Wenatchee to Leavenworth. Most of U.S. 2 to between Wenatchee and Leavenworth is 4-lanes and divided. It becomes 2-lanes from the U.S. 97 and U.S. 2 junction to Leavenworth.
The Blewett Pass Highway is mostly 2-lanes with 3-lanes on the grades with an especially long stretch of 3-lane roadway approaching the summit going north. The pass (Blewett or technically, the old Swauk Pass) is over 4,100 feet in elevation, higher than either Snoqualmie or Stevens.
The Blewett Pass Highway is not as curvy as it once was. In the 1950s, they straightened it out quite a bit. The old highway had over 240 curves. When they built the new road, they whittled the curves down to about 35 gentle curves.
I lived in Kittitas County decades ago and used to drive a truck between Ellensburg and Wenatchee. In the winter, we'd occasionally had to put on chains going over Blewett but not often as the precipitation is not nearly as much as the western passes like Snoqualmie and Stevens receive.
Remember, you can use Google Street View to see ANY part of the road on the highway. For example, here is a shot of the roadway at the summit CLICK HERE
Here is a shot before starting the climb going north CLICK HERE
and before starting the climb going south CLICK HERE
You can pan 360-degrees on the images and also click on the arrows to move down the road in either direction …or open the map back up and choose another location on the highway.