PCL language

Hi All,

We have been using the plotter HP DJ ColorPro CAD 600 dpi.
It let us print raster files like .tiff and .crl (Color Run Length)
without any problems.
It uses PCL 5 language.

Now we need a plotter for A0 sheets so we think about buying
the HP DJ 500 1200*600 dpi.
It uses PCL 3 language.

What is the difference between PCL 5 and PCL 3?
Is it possible that the HP DJ 500 with PCL 3 won't be able
to plot .tiff and .crl files properly?

Regards,
Ewa