Semoochie, the only "early 1970" playlist I could find for KDIA was the week of January 27.
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KFRC's for the same week:
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KFRC's hitbounds that week included Brook Benton's "Rainy Night in Georgia", so there were eight songs that week that KFRC and KDIA had in common---but if you look at KDIA's top ten---presumably the heaviest rotation---four of
those songs were also on KFRC. In fact, three of them were in KFRC's top four.
Plus---KFRC was still on "Friendship Train", and Stevie Wonder's "Never Had A Dream Come True" was hitbound, (but not on the KDIA chart---was KFRC late or early?) giving it still more R&B flavor. And KDIA was still on the Supremes' "Someday We'll Be Together", which had just dropped off the KFRC chart.
And, if you look at the rest of the KDIA chart, there are songs that KFRC soon would be playing---The Delfonics' "Didn't I (Blow Your Mind This Time)", The Originals' "The Bells", and the Chairmen of the Board's "Give Me Just A Little More Time". So, if you were listening a couple of weeks after this, the stations would have had eleven songs in common on their charts.
Put that together with whatever Gold the two stations had in common, and how KDIA rotated its records, and it's not at all unreasonable to wonder, while listening, at that time, if you could be hearing a Top 40 station with a harder R&B lean---which in Oakland, would not be out of the question.