Qn abt infighter and gunslinger

according to wat i know, a infighter will gain appro. 2times hp of a infighter when lvling normally ( not hp washed e.g.)

according to wat i know, if adding 1 ap to hp for a pirate case will add appro. 16-21hp...

according to wat i know, a avg. infighter lvl-up will gain abt 50+ and a gunslinger will add abt 20+ hp per lvling..

qn is... if i as a gunslinger lvl up and i add 1 to hp, will tt mean tt my hp will be abt the same as a infighter??

any1 knows if the "according to wat i know" part is correct?? or if im wrong??