Running bigger tires on the front in the sand

I will be heading to Glamis over Christmas with my rzr900S last time I was there, I had an 800 and bought some 26" paddles. I would like to run them on my 900 but it only have a set of 27" to put on the front (I’m currently running 29" big horns) Will that cause a problem with the 4X4 or will I not really need 4X4 that much due to having more power?

I’m kind of a dune newbee so any advice would be appreciated

Thanks
Aron