yes it is the same engine, it is the same compression, the only difference is the windage tray on the msp version of the engine has a oil return fitting tapped already...you'll have to tap an oil return fitting into the oil pan if you go with a regular protege motor
the fs-de is the fs-de, whether or not it's an msp or not...the fs-ze IS different, but not availible in the US as it was the higher compression version of the FS-DE used in the Japanese version of the Mazdaspeed protege...the ZE was naturally aspirated with higher compression pistons (I believe somewhere between 10-10.5:1 as opposed to 9.1:1, if I recall correctly) as well as better camshafts and a different tune...ironically it hit higher numbers on the dyno (stock vs. stock) than the turbocharged version of the DE that we got hahaha
however, the woman is right...they really can't offer a warranty on an engine that wasn't designed for a turbocharger, even if it is the same...take an n/a motor and turbocharge it and you significantly increase the chances of the motor blowing...mazda had this same warranty issue too when msp engines started blowing even when they were stock
the fs-de is the fs-de, whether or not it's an msp or not...the fs-ze IS different, but not availible in the US as it was the higher compression version of the FS-DE used in the Japanese version of the Mazdaspeed protege...the ZE was naturally aspirated with higher compression pistons (I believe somewhere between 10-10.5:1 as opposed to 9.1:1, if I recall correctly) as well as better camshafts and a different tune...ironically it hit higher numbers on the dyno (stock vs. stock) than the turbocharged version of the DE that we got hahaha
however, the woman is right...they really can't offer a warranty on an engine that wasn't designed for a turbocharger, even if it is the same...take an n/a motor and turbocharge it and you significantly increase the chances of the motor blowing...mazda had this same warranty issue too when msp engines started blowing even when they were stock