The 9200 has a shorter hood, and the engine sits farther back into the cab, leaving somewhat less room inside the cab. The engine being more inside the cab also makes for more engine noise, and the rear of the engine is harder to reach from under the hood.
Usually 9200 would have a 12,000 front end and 9400 would have 14,000. Both could have an ISX but there are HP limits on the 9200. 9200 would have the smaller ISM or c12, where as the 9200 would have higher HP ISX, or c15.