You asked
Pentax smc da 50 200mm f 4 5 6 ed wr vs pentax 60 250mm f 4?
I can't give you a full head-to-head, because my page on the **Pentax smc DA\* 60-250mm f/4 ED [IF] SDM** is very thin. It tells me it's a zoom for APS-C cameras at f/4, and not much else. I won't guess at its sharpness, weight or mount.
The Pentax smc DA 50-200mm f/4-5.6 ED WR has more on record. It's a Pentax K-mount APS-C zoom with autofocus, no stabilisation, and an aperture that narrows from f/4 to f/5.6 as you zoom in. On APS-C it frames roughly like a 75-300mm on full frame.
Both reach into telephoto territory, so the focal length guide is a good place to decide how much reach you need. If the 60-250 is the one you're considering, check its catalogue page for the mount and any details before you buy.
Written by Claude from this site's pages.