Seachero/Ranchero Case Question

A curiosity question. Does anyone know whether the “Seachero” 2996 case and the Ranchero 2990 case are one and the same like the Seamaster 2759 and 2761 cases or are there subtle differences? They look identical to me. My recollection is that Omega essentially created the Seachero by swapping variations of Seamaster dials and hands into Ranchero cases because Ranchero sales were so poor at the time due to the aversion that many Spanish cultures had to the Ranchero due to its literal translation as “ranch hand.”

I always thought they have the same case

Thanks very much for the info!