Sure.
Go to the asset web page, click "Edit asset" in the asset option list at the left to go in edit mode and change the model computer model. Make sure the updated computer model is lock from being overwritten during a new scan.
In the asset list (when you click on "Assets" between Dashboard and Reports in the menu, you can multiselect the computers of this model and select "Mass change" in the asset option list at the left. This mass change is available starting from version 5.1