Thats what I do mean a eg. 440 making peak power at 5000 rpm and a 273 making peak power 8060 rpm are practically/partially the same cause both are displacing 637 cfm of air at 100% VE, depending on the efficiencies of the builds should be within a relatively narrow horsepower output between the two. Obviously the 440 has more advantage of being a more streetable package, and yes you could build an 8000 rpm 440 which would need a 13,000 rpm 273 and be very impractical. And if both are geared for maximum ET's they put similar torque to the ground, and possibly similar ET's, It's up to the individual which way is best for them.
