The best way would be change the channels to a different number on each router.
Usually you have up to 11 channels, I think.
So set one up one channel 3 and another on channel 8 or something like that.
I think each router should be able to transfer to the other one via the ethernet cable so you should still be able to share files or the wi fi from a pc on one channel to a pc on a different one but I am not 100% certain about this.