Alternative power chargers for Portege Z830

Hello,
I 've got PORTEGE Z830-11M and with original 45W, 19V *PA3822U-1ACA* AC Adapter.
Can I use for charging it also more powerful 75W, 19V original TOSHIBA *PA3468E-1AC3* adapter, which I have on the other location?
Is it good for z830 or not and why? The only difference between them is power, I suppose more is better (less heat for charger) or not?
Thank you for answers.
Tomo
Message was edited by: Tomaz

Brixx, thank you for answer, but I still don't know, why TOSHIBA service says that I should use exactly PA3822U-1ACA AC Adapter.
There are many TOSHIBA types of chargers with DC 19V output connector 5.5/2.5 mm and also other brands like ASUS which with their electrical specifications fit z830 laptop.
I would say, all chargers with at least 45 W and constant 19V DC voltage and of course 5.5/2.5 mm connector would be OK. But it seems they are not. I'm interested why?
DC electric current depends on DC voltage and battery resistance. So if PA3822U-1ACA has constant DC voltage 19 V for load 0 - 45 W, why other more powerful chargers are not recomended?
Is there any electronics inside charger which comunicates with z830 laptop and limits current (adapt voltage to limit current - so 19V is not constant) ... or such electronics is inside z830?
Tomaz

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