They are the same. Both are EGES1052. This is the engine REPAIR manual. This not the DIAGNOSTIC manual. A '97 DT most likely has the 3Box injection system. I believe that manual is EGES145 but I'm not at work so I'm not certain.
If it doesn't fit, FORCE it. If it breaks, well, it needed replacing anyway. Pullin' wrenches for 45 years.