Seamless Dialogue Audio Matching

I have several vocal sessions recorded in different studios that need to be blended so they play back as one consistent track for a podcast-style audio book. All takes are in the same language, yet the room tone, mic characteristics, breathing, dead air, and overall ambience vary noticeably... (Budget: $250 - $750 USD, Jobs: Audio Editing, Audio Engineering, Audio Mastering, Audio Processing, Audio Production, Podcast Editing, Sound Design)