I think you might find that you need to run a 7-10mm spacer on the rear based on what I've seen - but give it a shot
I actually mounted the 325/30r20 on the stock rear to test it first and it was that which helped me decide on an 18mm offset rear wheel rather than a 25mm. I didn't find a 335/30r20 in NZ at all so I didn't try one.
Just one thing to consider - how old are these tyres and what are they exactly? They might actually be very old or bad tyres like PZeros