bighorn stock radio speaker replacement?

[bobby11210]

I have a 2019 bighorn with stick radio 6 speaker and have a 8.4 no NAV radio. A stereo place near me said i can replace the stock speakers with kicker 6x9 without any problems or amp needed. Is this correct and the possible ohm difference will be ok? And this will not mess with the active noise cancellation since no new amp is placed?
I have read other stories with people needing datalink maestro and /or dsri sound processors which is not working correctly.
thanks in advance.