What was your printing workflow?
Sounds like you weren't printing with any icc profile?
Or do you print with a canned profile, the one you downloaded from the paper manufacturer's website.
There is a not so right way to do it when you were trying to simulate the look of another printer.
Let's say you use the same paper for both printers and you do have proper profiles for both of them as well.
In Photoshop, open your image (better be the one you had printed with your old printer and you still have your print on your hand), go to edit-> convert profile, convert your image to the previous printer profile (P800) with whatever rendering intent you used to print with (Let's say Percptual), then, go to print dialog, go to your driver and setup the right printer driver's settings, go back to print diaglog, select Photoshop manages color with abosolute colorimetric for rendering intent, click print, then you should be able to simulate your previous print look with your new printer.
This "MIGHT" work or maybe doesn't, but worth a try.
aaron