To add to what Kurt said, Monkey frogs need significantly higher temps and significantly less humidity than red eyes. Red eyes are around 75-85 degrees F day temps/65-75 degree night temps with humidity 60%-90%, whereas Monkey frogs need day temps in the 90s (90-95 degrees F)/night temps as high as 80 degrees recommended with humidity in a more moderate range not exceeding 60%. I think you'd be looking at two very different enclosures just based on climate control alone.
disclaimer: I don't keep Monkey frogs so I haven't compared sources or done extensive research. This is just according to my tree frog reference book.