No, it's the full thing. Jaegers are immortal, they progressively turn into monsters. It is a process that goes on for centuries. Most look mostly human, only the generals are more monsterous and are likely much older. We see this from the time advanced progression of Vole. He aged centuries in seconds and turned full on monster.
Question is, what about Gilgamesh? He had some jaegerdraught, but it wasn't as much as Zeetha. Agatha had some too, but probably will not turn, or Higgs would not have given her any. The Heterodynes are masters of the Dyne as so are not directly effected by it. This could mean Higgs has Heterodyne ancestry
The one difference is that neither of them swore the Jaeger oath, normally a prerequisite to getting the jaegerdraught. Both were I believe honorary Jaegers already. Gil certainly was with 'Schmott Guy', Zeetha had their respect but more to the point needed the draught to survive her injuries.