I created an MSAG from the Road Centerline file. I'll see if I can recreate the exact steps or build a model this week. Here is the gist of the process I used.
1. Create a unique key field such as Full Road Name + ESN
2. Dissolve the Road Centerline based on the Unique Key
3. Create High and Low fields
4. Populate High fields from the To Fields.
5. Populate the Low fields from the From Fields.
6. Create the Unique Key field in the MSAG
7. Join the two together
8. Use a select by attribute query to find all MSAG records that fall outside the Road Centerline ranges and vice versa.
-Steven