Planning for different distance goal events with the same focus

I’m just curious about how Xert recommends handling events that have the same focus, but different total time. To me it would make sense that the training for a 4 hour Breakaway Specialist MTB race would be different from training for an hour Breakaway Specialist CX race, right? So if that’s the case, how should the training be different if you planned on racing MTB Marathons in the early season, then CX in the fall? Should you just try to have your Training Load be lower while training for CX than MTB Marathon?