Interesting question. I don't have canon about it, but probably it was because the Red Eye and the White Hand had contacts and had a collaboration agreement together, like the 2 orc bands that attacked together the 9 companions, killed Boromir, and took Pippin and Merry at the falls of Rauros. Furthermore, in Ithilien and Anorien, there would be spies, errand riders and "diplomatic" embassies from Saruman to Sauron. Not only orcs, but also men of Dunland. And maybe as you say also a watch for the ringbearer of whom Saruman was certainly aware, even if not of his final destination, just in case. Like the band at Rauros was on the watch.
And Saruman's plan was to attack Gondor after Rohan, no question about that. Which brings to another obscure point: maybe Denethor and Saruman were aware of each other through the Palantiri.
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