Totally different.

DD1 - Labour began with irregular tightenings, pre labour stuff, high whole tummy action. No ROM until it was done in hospital.
DD2 - ROM first, with no labour, took 4-5 hours for labour to begin, another 3-4 for it to become established labour, then progressed through contrax intensity til birth.

ETA: Both were spontaneous, the first born at 41 +1 and the second at born 41 weeks exactly, but due to their lengths, means they actually started on the same gestation.