Ya need more than a month to do it, otherwise, well, look what happened, Pulled hammie and NO time…
If you’re not looking at the time scale, and still wondering about the differences, then;
Racing into shape will generally require at least a solid Base to work off from.
Training into shape, slowly leads you faster and faster over time. A bit faster at a time.
Racing will be as fast as you can at the time. Not so with Training.
Hope it makes sence?