Answer.
DIFFERENCE
Photosystem1 or PS 1 absorb longer wavelengths of light iof 700mm
PS II absorbs shorter wavelengths of light of 680 mm.
SIMILARIITY
The Pigments of both PSI and PSIiI absorps energy from sunlight to the electrons.
Products.
PS1- NADPH.
PSIi-ATP.
Step-by-step explanation:
Both PS I and II are two muti-subunit membrane protein complexes for absorbin photons of energy to electrons in light dependent stage of photosynthesis.