Collenchyma differs from parenchyma in possessing thick cell wall having deposition of pectin at the corners.
While $\rightarrow$ Sclerenchymatous cell lack protoplasm
$\rightarrow$ Both parenchyma and collenchyma when contain chloroplast then known as Chlorenchyma
$\rightarrow$ Collenchyma and Parenchyma both are simple permanent tissue which loose their capacity to divide hence, not meristematic.