both that 44 and 404 look good from the one photo of each (tell tails of constant overfire are when you see paint turning whitish around the top portions of firepot area and center of top plate). Micheal is absolutely right about that 404! the cost difference between these two models is 3x! the 404 clearly has a cast "trim kit" installed, it also has all 3 glass panes in place, i can see the firepot through the glass and does not appear to be warped towards the center rear (another tell tail of overfiring), in all likleyhood the buyer who could afford to have that cast "trim kit" also bought a blower for it (404's came with a 2 speed or variable speed Fasco blower worth approx $150 today). If that 404 was within reach of me id be buying myself!!!!
The 44 also looks in great shape and might include a hearth pad (you dont need), and black pipe/baro (that may or may not be OK... typically when doing a new install only the foolish man would use used black pipe), that 44 has upgraded hinge pins (meaning its a later model built after 1982), the key things to look at are the grate (check for warpage & cracks in it) and the firebrick (check for wear at the point the grate makes contact with the brick and make sure the gap is not more than 1/2 inch around the circumference)...
the firebrick on the 44 can be replaced for $150, the firepot on the 404 can be replaced for $600 (unless someone will help me produce some at which point the price would be more like $200). the 44 grate is about $195 to replace (unless and until someone will help produce some at which point they would be about $75.00).
either stove is undeniably a great coal burner and either stove can withstand neglect, overfiring, both are solid welded 1/4 inch steel and never ever require re glue, re screw, re build... they will be as air tight as day one with only replacement gasket. they are both fairly easy to learn (the 44 is probably the easiest coal burning stove that is bullet proof and could be run by a 2 year old or 90 year old equally well).
if the 44 is MINT (its worth it), if the 44 needs grate or firebrick (offer $100), the 404 is worth the $200 (i dont care what shape its in when you arrive!)