Could predictions of an astrologer and palmist (both experts in respective fields) be contradictory? What is authentic source of palmistry?

Jai shree ram, neech retro planet in 12th house exchanges house with another retro planet, does it cause a neechbhang. If so when does it form a rajyog? (There are also views that retro planets are not subject to debilitation.)

Jai shree Ram. How to read results of retro Saturn in 2nd house and retro Jupiter in 12th house for Aquarius ascendant. Thank

Jai shree Ram. How to read results of retro Saturn in 2nd house and retro Jupiter in 12th house for Aquarius ascendant?