Well - I think it basically is... but the grade is what you need to be carefull of..
I had an old panasonic 600dpi laser that was good because it used cheap toner replacement bottles instead of replacing the expensive whole cartridge. When it finally died - I had a bottle of toner left over..
Later I purchased a lexmark e220 600dpi laser from aldi - when the toner ran out, i was up for $125 for more toner... so I drilled a hole in the cartridge carefully to ensure no plastic pieces entered - then I poured my panasonic toner into it - worked fine! needed to run about 10 test pages to get the toner to spread around before the print was normal and the excess toner no loger dirtied the pages...
since then I have simply purchase bottles of this $45 panasonic toner instead of paying $125 for a new lexmark cartridge...
of course - the green roller only has a certain life span and in a small home laser that's about 10-15k pages... seeing each toner refill does about 2k pages, I can refill approx 4-6 times...
I have refilled 3 times so far on my lexmark printer and it still prints like the day we got it! The only bummer is that this older panasonic toner is no longer being made I think as the printer was around in the lat 1990's and has not been sold for about 10 years
LOL - so the morale is - I think as long as you stick to the same grade - ie: same dpi rating, you are probably safe...
But try at your own risk as I may have been lucky.. but i'd say more than likely most black toner is much the muchness...
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